diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 12fe622c56..f5379f8392 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -45,6 +45,7 @@ microutils-coroutines = { module = "dev.inmo:micro_utils.coroutines", version.re
 microutils-serialization-base64 = { module = "dev.inmo:micro_utils.serialization.base64", version.ref = "microutils" }
 microutils-serialization-encapsulator = { module = "dev.inmo:micro_utils.serialization.encapsulator", version.ref = "microutils" }
 microutils-serialization-typedSerializer = { module = "dev.inmo:micro_utils.serialization.typed_serializer", version.ref = "microutils" }
+microutils-serialization-mapper = { module = "dev.inmo:micro_utils.serialization.mapper", version.ref = "microutils" }
 microutils-languageCodes = { module = "dev.inmo:micro_utils.language_codes", version.ref = "microutils" }
 microutils-ktor-common = { module = "dev.inmo:micro_utils.ktor.common", version.ref = "microutils" }
 microutils-fsm-common = { module = "dev.inmo:micro_utils.fsm.common", version.ref = "microutils" }
diff --git a/tgbotapi.api/src/jvmMain/kotlin/dev/inmo/tgbotapi/extensions/api/files/DownloadFileToFile.kt b/tgbotapi.api/src/jvmMain/kotlin/dev/inmo/tgbotapi/extensions/api/files/DownloadFileToFile.kt
index 05ed333073..1174d1162d 100644
--- a/tgbotapi.api/src/jvmMain/kotlin/dev/inmo/tgbotapi/extensions/api/files/DownloadFileToFile.kt
+++ b/tgbotapi.api/src/jvmMain/kotlin/dev/inmo/tgbotapi/extensions/api/files/DownloadFileToFile.kt
@@ -9,6 +9,7 @@ import dev.inmo.tgbotapi.types.files.TelegramMediaFile
 import dev.inmo.tgbotapi.types.message.content.MediaContent
 import io.ktor.util.cio.use
 import io.ktor.util.cio.writeChannel
+import io.ktor.utils.io.copyAndClose
 import io.ktor.utils.io.copyTo
 import kotlinx.coroutines.job
 import java.io.File
@@ -25,7 +26,7 @@ suspend fun TelegramBot.downloadFile(
     doOutsideOfCoroutine { destFile.createNewFile() }
 
     destFile.writeChannel(coroutineContext.job).use {
-        readChannel.copyTo(this)
+        readChannel.copyAndClose(this)
     }
 
     return destFile
diff --git a/tgbotapi.api/src/jvmMain/kotlin/dev/inmo/tgbotapi/extensions/api/files/DownloadFileToTempFile.kt b/tgbotapi.api/src/jvmMain/kotlin/dev/inmo/tgbotapi/extensions/api/files/DownloadFileToTempFile.kt
index 299e9d1ddd..5f8f6fd75f 100644
--- a/tgbotapi.api/src/jvmMain/kotlin/dev/inmo/tgbotapi/extensions/api/files/DownloadFileToTempFile.kt
+++ b/tgbotapi.api/src/jvmMain/kotlin/dev/inmo/tgbotapi/extensions/api/files/DownloadFileToTempFile.kt
@@ -30,11 +30,17 @@ suspend fun TelegramBot.downloadFileToTemp(
 
 suspend fun TelegramBot.downloadFileToTemp(
     pathedFile: PathedFile
-) = downloadFileToTemp(
+): File = downloadFileToTemp(
     pathedFile.filePath
-).apply {
-    runCatching {
-        renameTo(File(parentFile, "$nameWithoutExtension.${pathedFile.fileName.fileExtension}"))
+).run {
+    val newFile = File(parentFile, "$nameWithoutExtension.${pathedFile.fileName.fileExtension}")
+    val success = runCatching {
+        renameTo(newFile)
+    }.getOrElse { false }
+    if (success) {
+        newFile
+    } else {
+        this@run
     }
 }
 
diff --git a/tgbotapi.core/build.gradle b/tgbotapi.core/build.gradle
index dac5a707a4..e8448b7c47 100644
--- a/tgbotapi.core/build.gradle
+++ b/tgbotapi.core/build.gradle
@@ -26,6 +26,7 @@ kotlin {
                 api libs.microutils.serialization.base64
                 api libs.microutils.serialization.encapsulator
                 api libs.microutils.serialization.typedSerializer
+                api libs.microutils.serialization.mapper
                 api libs.microutils.ktor.common
                 api libs.microutils.languageCodes
 
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/abstracts/InputFile.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/abstracts/InputFile.kt
index afd6df3640..67b126c235 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/abstracts/InputFile.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/abstracts/InputFile.kt
@@ -36,8 +36,10 @@ sealed class InputFile {
     }
 }
 
+internal const val attachPrefix = "attach://"
+
 internal inline val InputFile.attachFileId
-    get() = "attach://$fileId"
+    get() = "$attachPrefix$fileId"
 internal inline val InputFile.fileIdToSend
     get() = when (this) {
         is FileId -> fileId
@@ -60,8 +62,8 @@ fun String.toInputFile() = FileId(this)
 @RiskFeature
 object InputFileSerializer : KSerializer<InputFile> {
     override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor(FileId::class.toString(), PrimitiveKind.STRING)
-    override fun serialize(encoder: Encoder, value: InputFile) = encoder.encodeString(value.fileId)
-    override fun deserialize(decoder: Decoder): FileId = FileId(decoder.decodeString())
+    override fun serialize(encoder: Encoder, value: InputFile) = encoder.encodeString(value.fileIdToSend)
+    override fun deserialize(decoder: Decoder): FileId = FileId(decoder.decodeString().removePrefix(attachPrefix))
 }
 
 // TODO:: add checks for files size
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendAnimation.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendAnimation.kt
index ae61f5c46d..d1a51fed56 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendAnimation.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendAnimation.kt
@@ -1,6 +1,7 @@
 package dev.inmo.tgbotapi.requests.send.media
 
 import dev.inmo.tgbotapi.requests.abstracts.*
+import dev.inmo.tgbotapi.requests.common.CommonMultipartFileRequest
 import dev.inmo.tgbotapi.requests.send.abstracts.*
 import dev.inmo.tgbotapi.requests.send.media.base.*
 import dev.inmo.tgbotapi.types.*
@@ -22,7 +23,7 @@ import kotlinx.serialization.*
 fun SendAnimation(
     chatId: ChatIdentifier,
     animation: InputFile,
-    thumb: InputFile? = null,
+    thumbnail: InputFile? = null,
     text: String? = null,
     parseMode: ParseMode? = null,
     spoilered: Boolean = false,
@@ -36,15 +37,13 @@ fun SendAnimation(
     allowSendingWithoutReply: Boolean? = null,
     replyMarkup: KeyboardMarkup? = null
 ): Request<ContentMessage<AnimationContent>> {
-    val animationAsFileId = (animation as? FileId) ?.fileId
     val animationAsFile = animation as? MultipartFile
-    val thumbAsFileId = (thumb as? FileId) ?.fileId
-    val thumbAsFile = thumb as? MultipartFile
+    val thumbAsFile = thumbnail as? MultipartFile
 
     val data = SendAnimationData(
         chatId,
-        animationAsFileId,
-        thumbAsFileId,
+        animation,
+        thumbnail ?.fileId,
         text,
         parseMode,
         null,
@@ -63,9 +62,9 @@ fun SendAnimation(
     return if (animationAsFile == null && thumbAsFile == null) {
         data
     } else {
-        MultipartRequestImpl(
+        CommonMultipartFileRequest(
             data,
-            SendAnimationFiles(animationAsFile, thumbAsFile)
+            listOfNotNull(animationAsFile, thumbAsFile).associateBy { it.fileId }
         )
     }
 }
@@ -73,7 +72,7 @@ fun SendAnimation(
 fun SendAnimation(
     chatId: ChatIdentifier,
     animation: InputFile,
-    thumb: InputFile? = null,
+    thumbnail: InputFile? = null,
     entities: TextSourcesList,
     spoilered: Boolean = false,
     duration: Long? = null,
@@ -86,15 +85,13 @@ fun SendAnimation(
     allowSendingWithoutReply: Boolean? = null,
     replyMarkup: KeyboardMarkup? = null
 ): Request<ContentMessage<AnimationContent>> {
-    val animationAsFileId = (animation as? FileId) ?.fileId
     val animationAsFile = animation as? MultipartFile
-    val thumbAsFileId = (thumb as? FileId) ?.fileId
-    val thumbAsFile = thumb as? MultipartFile
+    val thumbAsFile = thumbnail as? MultipartFile
 
     val data = SendAnimationData(
         chatId,
-        animationAsFileId,
-        thumbAsFileId,
+        animation,
+        thumbnail ?.fileId,
         entities.makeString(),
         null,
         entities.toRawMessageEntities(),
@@ -113,9 +110,9 @@ fun SendAnimation(
     return if (animationAsFile == null && thumbAsFile == null) {
         data
     } else {
-        MultipartRequestImpl(
+        CommonMultipartFileRequest(
             data,
-            SendAnimationFiles(animationAsFile, thumbAsFile)
+            listOfNotNull(animationAsFile, thumbAsFile).associateBy { it.fileId }
         )
     }
 }
@@ -128,7 +125,7 @@ data class SendAnimationData internal constructor(
     @SerialName(chatIdField)
     override val chatId: ChatIdentifier,
     @SerialName(animationField)
-    val animation: String? = null,
+    val animation: InputFile,
     @SerialName(thumbnailField)
     override val thumbnail: String? = null,
     @SerialName(captionField)
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendAudio.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendAudio.kt
index dcb1d268f5..b2399f9fed 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendAudio.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendAudio.kt
@@ -2,6 +2,7 @@ package dev.inmo.tgbotapi.requests.send.media
 
 import dev.inmo.tgbotapi.abstracts.Performerable
 import dev.inmo.tgbotapi.requests.abstracts.*
+import dev.inmo.tgbotapi.requests.common.CommonMultipartFileRequest
 import dev.inmo.tgbotapi.requests.send.abstracts.*
 import dev.inmo.tgbotapi.requests.send.media.base.*
 import dev.inmo.tgbotapi.types.*
@@ -23,7 +24,7 @@ import kotlinx.serialization.*
 fun SendAudio(
     chatId: ChatIdentifier,
     audio: InputFile,
-    thumb: InputFile? = null,
+    thumbnail: InputFile? = null,
     text: String? = null,
     parseMode: ParseMode? = null,
     duration: Long? = null,
@@ -36,15 +37,13 @@ fun SendAudio(
     allowSendingWithoutReply: Boolean? = null,
     replyMarkup: KeyboardMarkup? = null
 ): Request<ContentMessage<AudioContent>> {
-    val audioAsFileId = (audio as? FileId) ?.fileId
     val audioAsFile = audio as? MultipartFile
-    val thumbAsFileId = (thumb as? FileId) ?.fileId
-    val thumbAsFile = thumb as? MultipartFile
+    val thumbAsFile = thumbnail as? MultipartFile
 
     val data = SendAudioData(
         chatId,
-        audioAsFileId,
-        thumbAsFileId,
+        audio,
+        thumbnail ?.fileId,
         text,
         parseMode,
         null,
@@ -62,9 +61,9 @@ fun SendAudio(
     return if (audioAsFile == null && thumbAsFile == null) {
         data
     } else {
-        MultipartRequestImpl(
+        CommonMultipartFileRequest(
             data,
-            SendAudioFiles(audioAsFile, thumbAsFile)
+            listOfNotNull(audioAsFile, thumbAsFile).associateBy { it.fileId }
         )
     }
 }
@@ -72,7 +71,7 @@ fun SendAudio(
 fun SendAudio(
     chatId: ChatIdentifier,
     audio: InputFile,
-    thumb: InputFile? = null,
+    thumbnail: InputFile? = null,
     entities: List<TextSource>,
     duration: Long? = null,
     performer: String? = null,
@@ -84,15 +83,13 @@ fun SendAudio(
     allowSendingWithoutReply: Boolean? = null,
     replyMarkup: KeyboardMarkup? = null
 ): Request<ContentMessage<AudioContent>> {
-    val audioAsFileId = (audio as? FileId) ?.fileId
     val audioAsFile = audio as? MultipartFile
-    val thumbAsFileId = (thumb as? FileId) ?.fileId
-    val thumbAsFile = thumb as? MultipartFile
+    val thumbAsFile = thumbnail as? MultipartFile
 
     val data = SendAudioData(
         chatId,
-        audioAsFileId,
-        thumbAsFileId,
+        audio,
+        thumbnail ?.fileId,
         entities.makeString(),
         null,
         entities.toRawMessageEntities(),
@@ -110,9 +107,9 @@ fun SendAudio(
     return if (audioAsFile == null && thumbAsFile == null) {
         data
     } else {
-        MultipartRequestImpl(
+        CommonMultipartFileRequest(
             data,
-            SendAudioFiles(audioAsFile, thumbAsFile)
+            listOfNotNull(audioAsFile, thumbAsFile).associateBy { it.fileId }
         )
     }
 }
@@ -125,7 +122,7 @@ data class SendAudioData internal constructor(
     @SerialName(chatIdField)
     override val chatId: ChatIdentifier,
     @SerialName(audioField)
-    val audio: String? = null,
+    val audio: InputFile,
     @SerialName(thumbnailField)
     override val thumbnail: String? = null,
     @SerialName(captionField)
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendDocument.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendDocument.kt
index 8ff04c4aca..98bc374dac 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendDocument.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendDocument.kt
@@ -1,6 +1,7 @@
 package dev.inmo.tgbotapi.requests.send.media
 
 import dev.inmo.tgbotapi.requests.abstracts.*
+import dev.inmo.tgbotapi.requests.common.CommonMultipartFileRequest
 import dev.inmo.tgbotapi.requests.send.abstracts.*
 import dev.inmo.tgbotapi.requests.send.media.base.*
 import dev.inmo.tgbotapi.types.*
@@ -31,7 +32,7 @@ import kotlinx.serialization.*
 fun SendDocument(
     chatId: ChatIdentifier,
     document: InputFile,
-    thumb: InputFile? = null,
+    thumbnail: InputFile? = null,
     text: String? = null,
     parseMode: ParseMode? = null,
     threadId: MessageThreadId? = chatId.threadId,
@@ -42,15 +43,13 @@ fun SendDocument(
     replyMarkup: KeyboardMarkup? = null,
     disableContentTypeDetection: Boolean? = null
 ): Request<ContentMessage<DocumentContent>> {
-    val documentAsFileId = (document as? FileId) ?.fileId
     val documentAsFile = document as? MultipartFile
-    val thumbAsFileId = (thumb as? FileId) ?.fileId
-    val thumbAsFile = thumb as? MultipartFile
+    val thumbAsFile = thumbnail as? MultipartFile
 
     val data = SendDocumentData(
         chatId,
-        documentAsFileId,
-        thumbAsFileId,
+        document,
+        thumbnail ?.fileId,
         text,
         parseMode,
         null,
@@ -66,9 +65,9 @@ fun SendDocument(
     return if (documentAsFile == null && thumbAsFile == null) {
         data
     } else {
-        MultipartRequestImpl(
+        CommonMultipartFileRequest(
             data,
-            SendDocumentFiles(documentAsFile, thumbAsFile)
+            listOfNotNull(documentAsFile, thumbAsFile).associateBy { it.fileId }
         )
     }
 }
@@ -85,7 +84,7 @@ fun SendDocument(
 fun SendDocument(
     chatId: ChatIdentifier,
     document: InputFile,
-    thumb: InputFile? = null,
+    thumbnail: InputFile? = null,
     entities: TextSourcesList,
     threadId: MessageThreadId? = chatId.threadId,
     disableNotification: Boolean = false,
@@ -95,15 +94,13 @@ fun SendDocument(
     replyMarkup: KeyboardMarkup? = null,
     disableContentTypeDetection: Boolean? = null
 ): Request<ContentMessage<DocumentContent>> {
-    val documentAsFileId = (document as? FileId) ?.fileId
     val documentAsFile = document as? MultipartFile
-    val thumbAsFileId = (thumb as? FileId) ?.fileId
-    val thumbAsFile = thumb as? MultipartFile
+    val thumbAsFile = thumbnail as? MultipartFile
 
     val data = SendDocumentData(
         chatId,
-        documentAsFileId,
-        thumbAsFileId,
+        document,
+        thumbnail ?.fileId,
         entities.makeString(),
         null,
         entities.toRawMessageEntities(),
@@ -119,9 +116,9 @@ fun SendDocument(
     return if (documentAsFile == null && thumbAsFile == null) {
         data
     } else {
-        MultipartRequestImpl(
+        CommonMultipartFileRequest(
             data,
-            SendDocumentFiles(documentAsFile, thumbAsFile)
+            listOfNotNull(documentAsFile, thumbAsFile).associateBy { it.fileId }
         )
     }
 }
@@ -143,7 +140,7 @@ data class SendDocumentData internal constructor(
     @SerialName(chatIdField)
     override val chatId: ChatIdentifier,
     @SerialName(documentField)
-    val document: String? = null,
+    val document: InputFile,
     @SerialName(thumbnailField)
     override val thumbnail: String? = null,
     @SerialName(captionField)
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendMediaGroup.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendMediaGroup.kt
index afb914b770..ff2ace3d9e 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendMediaGroup.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendMediaGroup.kt
@@ -2,10 +2,12 @@ package dev.inmo.tgbotapi.requests.send.media
 
 import dev.inmo.tgbotapi.requests.abstracts.MultipartFile
 import dev.inmo.tgbotapi.requests.abstracts.Request
+import dev.inmo.tgbotapi.requests.common.CommonMultipartFileRequest
 import dev.inmo.tgbotapi.requests.send.abstracts.SendMessageRequest
 import dev.inmo.tgbotapi.requests.send.media.base.*
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.media.*
+import dev.inmo.tgbotapi.types.message.abstracts.ContentMessage
 import dev.inmo.tgbotapi.types.message.abstracts.PossiblySentViaBotCommonMessage
 import dev.inmo.tgbotapi.types.message.abstracts.TelegramBotAPIMessageDeserializeOnlySerializerClass
 import dev.inmo.tgbotapi.types.message.content.MediaGroupPartContent
@@ -37,7 +39,7 @@ fun <T : MediaGroupPartContent> SendMediaGroup(
     protectContent: Boolean = false,
     replyToMessageId: MessageId? = null,
     allowSendingWithoutReply: Boolean? = null
-): Request<PossiblySentViaBotCommonMessage<MediaGroupContent<T>>> {
+): Request<ContentMessage<MediaGroupContent<T>>> {
     if (media.size !in mediaCountInMediaGroup) {
         throwRangeError("Count of members in media group", mediaCountInMediaGroup, media.size)
     }
@@ -66,11 +68,11 @@ fun <T : MediaGroupPartContent> SendMediaGroup(
     return (if (files.isEmpty()) {
         data
     } else {
-        MultipartRequestImpl(
+        CommonMultipartFileRequest(
             data,
-            SendMediaGroupFiles(files)
+            files.associateBy { it.fileId }
         )
-    }) as Request<PossiblySentViaBotCommonMessage<MediaGroupContent<T>>>
+    }) as Request<ContentMessage<MediaGroupContent<T>>>
 }
 
 /**
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendPhoto.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendPhoto.kt
index 0c54d063e5..d030d66cba 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendPhoto.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendPhoto.kt
@@ -1,6 +1,7 @@
 package dev.inmo.tgbotapi.requests.send.media
 
 import dev.inmo.tgbotapi.requests.abstracts.*
+import dev.inmo.tgbotapi.requests.common.CommonMultipartFileRequest
 import dev.inmo.tgbotapi.requests.send.abstracts.*
 import dev.inmo.tgbotapi.requests.send.media.base.*
 import dev.inmo.tgbotapi.types.*
@@ -33,7 +34,7 @@ fun SendPhoto(
 ): Request<ContentMessage<PhotoContent>> {
     val data = SendPhotoData(
         chatId,
-        (photo as? FileId) ?.fileId,
+        photo,
         text,
         parseMode,
         null,
@@ -45,12 +46,14 @@ fun SendPhoto(
         allowSendingWithoutReply,
         replyMarkup
     )
-    return data.photo ?.let {
+    return if (photo is MultipartFile) {
+        CommonMultipartFileRequest(
+            data,
+            listOf(photo).associateBy { it.fileId }
+        )
+    } else {
         data
-    } ?:  MultipartRequestImpl(
-        data,
-        SendPhotoFiles(photo as MultipartFile)
-    )
+    }
 }
 
 fun SendPhoto(
@@ -67,7 +70,7 @@ fun SendPhoto(
 ): Request<ContentMessage<PhotoContent>> {
     val data = SendPhotoData(
         chatId,
-        (photo as? FileId)?.fileId,
+        photo,
         entities.makeString(),
         null,
         entities.toRawMessageEntities(),
@@ -79,12 +82,15 @@ fun SendPhoto(
         allowSendingWithoutReply,
         replyMarkup
     )
-    return data.photo ?.let {
+
+    return if (photo is MultipartFile) {
+        CommonMultipartFileRequest(
+            data,
+            listOf(photo).associateBy { it.fileId }
+        )
+    } else {
         data
-    } ?:  MultipartRequestImpl(
-        data,
-        SendPhotoFiles(photo as MultipartFile)
-    )
+    }
 }
 
 private val commonResultDeserializer: DeserializationStrategy<ContentMessage<PhotoContent>>
@@ -95,7 +101,7 @@ data class SendPhotoData internal constructor(
     @SerialName(chatIdField)
     override val chatId: ChatIdentifier,
     @SerialName(photoField)
-    val photo: String? = null,
+    val photo: InputFile,
     @SerialName(captionField)
     override val text: String? = null,
     @SerialName(parseModeField)
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendSticker.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendSticker.kt
index 3de84286d7..46897671d6 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendSticker.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendSticker.kt
@@ -1,6 +1,7 @@
 package dev.inmo.tgbotapi.requests.send.media
 
 import dev.inmo.tgbotapi.requests.abstracts.*
+import dev.inmo.tgbotapi.requests.common.CommonMultipartFileRequest
 import dev.inmo.tgbotapi.requests.send.abstracts.ReplyingMarkupSendMessageRequest
 import dev.inmo.tgbotapi.requests.send.abstracts.SendMessageRequest
 import dev.inmo.tgbotapi.types.*
@@ -28,7 +29,7 @@ fun SendSticker(
     replyMarkup: KeyboardMarkup? = null
 ): Request<ContentMessage<StickerContent>> = SendStickerByFileId(
     chatId,
-    sticker as? FileId,
+    sticker,
     threadId,
     disableNotification,
     protectContent,
@@ -37,7 +38,10 @@ fun SendSticker(
     replyMarkup
 ).let {
     when (sticker) {
-        is MultipartFile -> SendStickerByFile(it, sticker, emoji)
+        is MultipartFile -> CommonMultipartFileRequest(
+            it,
+            listOf(sticker).associateBy { it.fileId }
+        )
         is FileId -> it
     }
 }
@@ -50,7 +54,7 @@ data class SendStickerByFileId internal constructor(
     @SerialName(chatIdField)
     override val chatId: ChatIdentifier,
     @SerialName(stickerField)
-    val sticker: FileId? = null,
+    val sticker: InputFile,
     @SerialName(messageThreadIdField)
     override val threadId: MessageThreadId? = chatId.threadId,
     @SerialName(disableNotificationField)
@@ -70,20 +74,3 @@ data class SendStickerByFileId internal constructor(
     override val requestSerializer: SerializationStrategy<*>
         get() = serializer()
 }
-
-data class SendStickerByFile internal constructor(
-    @Transient
-    private val sendStickerByFileId: SendStickerByFileId,
-    val sticker: MultipartFile,
-    val emoji: String?
-) : MultipartRequest<ContentMessage<StickerContent>>, Request<ContentMessage<StickerContent>> by sendStickerByFileId {
-    override val mediaMap: Map<String, MultipartFile> = mapOf(stickerField to sticker)
-    override val paramsJson: JsonObject
-        get() {
-            return JsonObject(
-                mapOfNotNull(
-                    emojiField to emoji ?.let { JsonPrimitive(it) }
-                ) + sendStickerByFileId.toJsonWithoutNulls(SendStickerByFileId.serializer())
-            )
-        }
-}
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendVideo.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendVideo.kt
index e427c4f10a..815e784969 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendVideo.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendVideo.kt
@@ -1,6 +1,7 @@
 package dev.inmo.tgbotapi.requests.send.media
 
 import dev.inmo.tgbotapi.requests.abstracts.*
+import dev.inmo.tgbotapi.requests.common.CommonMultipartFileRequest
 import dev.inmo.tgbotapi.requests.send.abstracts.*
 import dev.inmo.tgbotapi.requests.send.media.base.*
 import dev.inmo.tgbotapi.types.*
@@ -22,7 +23,7 @@ import kotlinx.serialization.*
 fun SendVideo(
     chatId: ChatIdentifier,
     video: InputFile,
-    thumb: InputFile? = null,
+    thumbnail: InputFile? = null,
     text: String? = null,
     parseMode: ParseMode? = null,
     spoilered: Boolean = false,
@@ -37,15 +38,13 @@ fun SendVideo(
     allowSendingWithoutReply: Boolean? = null,
     replyMarkup: KeyboardMarkup? = null
 ): Request<ContentMessage<VideoContent>> {
-    val videoAsFileId = (video as? FileId) ?.fileId
     val videoAsFile = video as? MultipartFile
-    val thumbAsFileId = (thumb as? FileId) ?.fileId
-    val thumbAsFile = thumb as? MultipartFile
+    val thumbAsFile = thumbnail as? MultipartFile
 
     val data = SendVideoData(
         chatId,
-        videoAsFileId,
-        thumbAsFileId,
+        video,
+        thumbnail ?.fileId,
         text,
         parseMode,
         null,
@@ -65,9 +64,9 @@ fun SendVideo(
     return if (videoAsFile == null && thumbAsFile == null) {
         data
     } else {
-        MultipartRequestImpl(
+        CommonMultipartFileRequest(
             data,
-            SendVideoFiles(videoAsFile, thumbAsFile)
+            listOfNotNull(videoAsFile, thumbAsFile).associateBy { it.fileId }
         )
     }
 }
@@ -75,7 +74,7 @@ fun SendVideo(
 fun SendVideo(
     chatId: ChatIdentifier,
     video: InputFile,
-    thumb: InputFile? = null,
+    thumbnail: InputFile? = null,
     entities: TextSourcesList,
     spoilered: Boolean = false,
     duration: Long? = null,
@@ -89,15 +88,13 @@ fun SendVideo(
     allowSendingWithoutReply: Boolean? = null,
     replyMarkup: KeyboardMarkup? = null
 ): Request<ContentMessage<VideoContent>> {
-    val videoAsFileId = (video as? FileId) ?.fileId
     val videoAsFile = video as? MultipartFile
-    val thumbAsFileId = (thumb as? FileId) ?.fileId
-    val thumbAsFile = thumb as? MultipartFile
+    val thumbAsFile = thumbnail as? MultipartFile
 
     val data = SendVideoData(
         chatId,
-        videoAsFileId,
-        thumbAsFileId,
+        video,
+        thumbnail ?.fileId,
         entities.makeString(),
         null,
         entities.toRawMessageEntities(),
@@ -117,9 +114,9 @@ fun SendVideo(
     return if (videoAsFile == null && thumbAsFile == null) {
         data
     } else {
-        MultipartRequestImpl(
+        CommonMultipartFileRequest(
             data,
-            SendVideoFiles(videoAsFile, thumbAsFile)
+            listOfNotNull(videoAsFile, thumbAsFile).associateBy { it.fileId }
         )
     }
 }
@@ -132,7 +129,7 @@ data class SendVideoData internal constructor(
     @SerialName(chatIdField)
     override val chatId: ChatIdentifier,
     @SerialName(videoField)
-    val video: String? = null,
+    val video: InputFile,
     @SerialName(thumbnailField)
     override val thumbnail: String? = null,
     @SerialName(captionField)
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendVideoNote.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendVideoNote.kt
index 914e50eafa..0c840feed0 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendVideoNote.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendVideoNote.kt
@@ -1,6 +1,7 @@
 package dev.inmo.tgbotapi.requests.send.media
 
 import dev.inmo.tgbotapi.requests.abstracts.*
+import dev.inmo.tgbotapi.requests.common.CommonMultipartFileRequest
 import dev.inmo.tgbotapi.requests.send.abstracts.*
 import dev.inmo.tgbotapi.requests.send.media.base.*
 import dev.inmo.tgbotapi.types.*
@@ -14,7 +15,7 @@ import kotlinx.serialization.*
 fun SendVideoNote(
     chatId: ChatIdentifier,
     videoNote: InputFile,
-    thumb: InputFile? = null,
+    thumbnail: InputFile? = null,
     duration: Long? = null,
     size: Int? = null, // in documentation - length (size of video side)
     threadId: MessageThreadId? = chatId.threadId,
@@ -24,15 +25,13 @@ fun SendVideoNote(
     allowSendingWithoutReply: Boolean? = null,
     replyMarkup: KeyboardMarkup? = null
 ): Request<ContentMessage<VideoNoteContent>> {
-    val videoNoteAsFileId = (videoNote as? FileId) ?.fileId
     val videoNoteAsFile = videoNote as? MultipartFile
-    val thumbAsFileId = (thumb as? FileId) ?.fileId
-    val thumbAsFile = thumb as? MultipartFile
+    val thumbAsFile = thumbnail as? MultipartFile
 
     val data = SendVideoNoteData(
         chatId,
-        videoNoteAsFileId,
-        thumbAsFileId,
+        videoNote,
+        thumbnail ?.fileId,
         duration,
         size,
         threadId,
@@ -46,9 +45,9 @@ fun SendVideoNote(
     return if (videoNoteAsFile == null && thumbAsFile == null) {
         data
     } else {
-        MultipartRequestImpl(
+        CommonMultipartFileRequest(
             data,
-            SendVideoNoteFiles(videoNoteAsFile, thumbAsFile)
+            listOfNotNull(videoNoteAsFile, thumbAsFile).associateBy { it.fileId }
         )
     }
 }
@@ -61,7 +60,7 @@ data class SendVideoNoteData internal constructor(
     @SerialName(chatIdField)
     override val chatId: ChatIdentifier,
     @SerialName(videoNoteField)
-    val videoNote: String? = null,
+    val videoNote: InputFile,
     @SerialName(thumbnailField)
     override val thumbnail: String? = null,
     @SerialName(durationField)
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendVoice.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendVoice.kt
index 0b914246fb..1bad25a36a 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendVoice.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/media/SendVoice.kt
@@ -1,6 +1,7 @@
 package dev.inmo.tgbotapi.requests.send.media
 
 import dev.inmo.tgbotapi.requests.abstracts.*
+import dev.inmo.tgbotapi.requests.common.CommonMultipartFileRequest
 import dev.inmo.tgbotapi.requests.send.abstracts.*
 import dev.inmo.tgbotapi.requests.send.media.base.*
 import dev.inmo.tgbotapi.types.*
@@ -32,12 +33,11 @@ fun SendVoice(
     allowSendingWithoutReply: Boolean? = null,
     replyMarkup: KeyboardMarkup? = null
 ): Request<ContentMessage<VoiceContent>> {
-    val voiceAsFileId = (voice as? FileId) ?.fileId
     val voiceAsFile = voice as? MultipartFile
 
     val data = SendVoiceData(
         chatId,
-        voiceAsFileId,
+        voice,
         text,
         parseMode,
         null,
@@ -53,9 +53,9 @@ fun SendVoice(
     return if (voiceAsFile == null) {
         data
     } else {
-        MultipartRequestImpl(
+        CommonMultipartFileRequest(
             data,
-            SendVoiceFiles(voiceAsFile)
+            listOfNotNull(voiceAsFile).associateBy { it.fileId }
         )
     }
 }
@@ -72,12 +72,11 @@ fun SendVoice(
     allowSendingWithoutReply: Boolean? = null,
     replyMarkup: KeyboardMarkup? = null
 ): Request<ContentMessage<VoiceContent>> {
-    val voiceAsFileId = (voice as? FileId) ?.fileId
     val voiceAsFile = voice as? MultipartFile
 
     val data = SendVoiceData(
         chatId,
-        voiceAsFileId,
+        voice,
         entities.makeString(),
         null,
         entities.toRawMessageEntities(),
@@ -93,9 +92,9 @@ fun SendVoice(
     return if (voiceAsFile == null) {
         data
     } else {
-        MultipartRequestImpl(
+        CommonMultipartFileRequest(
             data,
-            SendVoiceFiles(voiceAsFile)
+            listOfNotNull(voiceAsFile).associateBy { it.fileId }
         )
     }
 }
@@ -108,7 +107,7 @@ data class SendVoiceData internal constructor(
     @SerialName(chatIdField)
     override val chatId: ChatIdentifier,
     @SerialName(voiceField)
-    val voice: String? = null,
+    val voice: InputFile,
     @SerialName(captionField)
     override val text: String? = null,
     @SerialName(parseModeField)
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/stickers/CreateNewStickerSet.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/stickers/CreateNewStickerSet.kt
index 7895e7ef93..5cf4afa885 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/stickers/CreateNewStickerSet.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/stickers/CreateNewStickerSet.kt
@@ -1,11 +1,15 @@
 package dev.inmo.tgbotapi.requests.stickers
 
+import dev.inmo.micro_utils.serialization.mapper.MapperSerializer
 import dev.inmo.tgbotapi.requests.abstracts.*
 import dev.inmo.tgbotapi.requests.common.CommonMultipartFileRequest
 import dev.inmo.tgbotapi.requests.stickers.abstracts.CreateStickerSetAction
 import dev.inmo.tgbotapi.types.*
 import dev.inmo.tgbotapi.types.stickers.MaskPosition
 import kotlinx.serialization.*
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
 
 /**
  * Will create one of [CreateNewStickerSet] types based on the first element of [stickers]
@@ -26,18 +30,30 @@ fun CreateNewStickerSet(
         is InputSticker.WithKeywords.CustomEmoji -> CreateNewStickerSet.CustomEmoji(userId, name, title, stickersFormat, stickers.filterIsInstance<InputSticker.WithKeywords.CustomEmoji>(), needsRepainting)
         is InputSticker.WithKeywords.Regular -> CreateNewStickerSet.Regular(userId, name, title, stickersFormat, stickers.filterIsInstance<InputSticker.WithKeywords.Regular>())
     }
-    val multipartParts = stickers.mapNotNull { (it.sticker as? MultipartFile) }
+    val multipartParts = stickers.mapNotNull {
+        (it.sticker as? MultipartFile)
+    }
     return if (multipartParts.isNotEmpty()) {
-        CommonMultipartFileRequest(
-            data,
-            multipartParts.associateBy { it.fileId }
-        )
+        when (data) { // cratch for exact determining of common multipart data type
+            is CreateNewStickerSet.CustomEmoji -> CommonMultipartFileRequest(
+                data,
+                multipartParts.associateBy { it.fileId }
+            )
+            is CreateNewStickerSet.Mask -> CommonMultipartFileRequest(
+                data,
+                multipartParts.associateBy { it.fileId }
+            )
+            is CreateNewStickerSet.Regular -> CommonMultipartFileRequest(
+                data,
+                multipartParts.associateBy { it.fileId }
+            )
+        }
     } else {
         data
     }
 }
 
-@Serializable
+@Serializable(CreateNewStickerSetSerializer::class)
 sealed interface CreateNewStickerSet : CreateStickerSetAction {
     val stickerType: StickerType
     val stickers: List<InputSticker>
@@ -101,4 +117,70 @@ sealed interface CreateNewStickerSet : CreateStickerSetAction {
         override val stickerType: StickerType
             get() = StickerType.CustomEmoji
     }
+
+    @Serializable
+    data class SurrogateCreateNewSticker internal constructor(
+        @SerialName(userIdField)
+        override val userId: UserId,
+        @SerialName(nameField)
+        override val name: String,
+        @SerialName(titleField)
+        override val title: String,
+        @SerialName(stickerFormatField)
+        val stickersFormat: StickerFormat,
+        @SerialName(stickersField)
+        val stickers: List<InputSticker>,
+        @SerialName(stickerTypeField)
+        val stickerType: StickerType,
+        @SerialName(needsRepaintingField)
+        val needsRepainting: Boolean? = null
+    ) : CreateStickerSetAction {
+        override val requestSerializer: SerializationStrategy<*>
+            get() = CreateNewStickerSet.serializer()
+
+        override fun method(): String = "createNewStickerSet"
+    }
 }
+
+object CreateNewStickerSetSerializer : KSerializer<CreateNewStickerSet>,
+    MapperSerializer<CreateNewStickerSet.SurrogateCreateNewSticker, CreateNewStickerSet>(
+    CreateNewStickerSet.SurrogateCreateNewSticker.serializer(),
+        {
+            CreateNewStickerSet.SurrogateCreateNewSticker(
+                it.userId,
+                it.name,
+                it.title,
+                it.stickersFormat,
+                it.stickers,
+                it.stickerType,
+                (it as? CreateNewStickerSet.CustomEmoji)?.needsRepainting
+            )
+        },
+        {
+            when (it.stickerType) {
+                StickerType.CustomEmoji -> CreateNewStickerSet.CustomEmoji(
+                    it.userId,
+                    it.name,
+                    it.title,
+                    it.stickersFormat,
+                    it.stickers.filterIsInstance<InputSticker.WithKeywords.CustomEmoji>(),
+                    it.needsRepainting
+                )
+                StickerType.Mask -> CreateNewStickerSet.Mask(
+                    it.userId,
+                    it.name,
+                    it.title,
+                    it.stickersFormat,
+                    it.stickers.filterIsInstance<InputSticker.Mask>(),
+                )
+                StickerType.Regular -> CreateNewStickerSet.Regular(
+                    it.userId,
+                    it.name,
+                    it.title,
+                    it.stickersFormat,
+                    it.stickers.filterIsInstance<InputSticker.WithKeywords.Regular>(),
+                )
+                is StickerType.Unknown -> error("Unable to create new sticker set due to error in type format: ${it.stickerType}")
+            }
+        }
+    )
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/stickers/InputSticker.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/stickers/InputSticker.kt
index 9633b555a7..874fff6676 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/stickers/InputSticker.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/stickers/InputSticker.kt
@@ -1,17 +1,20 @@
 package dev.inmo.tgbotapi.requests.stickers
 
+import dev.inmo.micro_utils.serialization.mapper.MapperSerializer
 import dev.inmo.tgbotapi.requests.abstracts.InputFile
+import dev.inmo.tgbotapi.types.StickerType
 import dev.inmo.tgbotapi.types.emojiListField
 import dev.inmo.tgbotapi.types.keywordsField
 import dev.inmo.tgbotapi.types.maskPositionField
 import dev.inmo.tgbotapi.types.stickerField
 import dev.inmo.tgbotapi.types.stickers.MaskPosition
 import dev.inmo.tgbotapi.utils.internal.ClassCastsIncluded
+import kotlinx.serialization.KSerializer
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
 @ClassCastsIncluded
-@Serializable
+@Serializable(InputStickerSerializer::class)
 sealed interface InputSticker {
     val sticker: InputFile
     val emojisList: List<String>
@@ -51,3 +54,69 @@ sealed interface InputSticker {
         ) : WithKeywords
     }
 }
+
+object InputStickerSerializer : KSerializer<InputSticker>, MapperSerializer<InputStickerSerializer.SurrogateInputSticker, InputSticker>(
+    SurrogateInputSticker.serializer(),
+    {
+        when (it) {
+            is InputSticker.Mask -> SurrogateInputSticker(
+                it.sticker,
+                it.emojisList,
+                emptyList(),
+                it.maskPosition,
+                StickerType.Mask
+            )
+            is InputSticker.WithKeywords.CustomEmoji -> SurrogateInputSticker(
+                it.sticker,
+                it.emojisList,
+                it.keywords,
+                null,
+                StickerType.CustomEmoji
+            )
+            is InputSticker.WithKeywords.Regular -> SurrogateInputSticker(
+                it.sticker,
+                it.emojisList,
+                it.keywords,
+                null,
+                StickerType.Regular
+            )
+        }
+    },
+    {
+        when (it.internalType) {
+            StickerType.CustomEmoji -> InputSticker.WithKeywords.CustomEmoji(
+                it.sticker,
+                it.emojisList,
+                it.keywords
+            )
+            StickerType.Mask -> InputSticker.Mask(
+                it.sticker,
+                it.emojisList,
+                it.maskPosition
+            )
+            StickerType.Regular -> InputSticker.WithKeywords.Regular(
+                it.sticker,
+                it.emojisList,
+                it.keywords
+            )
+            is StickerType.Unknown -> InputSticker.WithKeywords.Regular(
+                it.sticker,
+                it.emojisList,
+                it.keywords
+            )
+        }
+    },
+) {
+    @Serializable
+    data class SurrogateInputSticker internal constructor(
+        @SerialName(stickerField)
+        val sticker: InputFile,
+        @SerialName(emojiListField)
+        val emojisList: List<String>,
+        @SerialName(keywordsField)
+        val keywords: List<String> = emptyList(),
+        @SerialName(maskPositionField)
+        val maskPosition: MaskPosition? = null,
+        internal val internalType: StickerType = StickerType.Unknown()
+    )
+}
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/content/Abstracts.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/content/Abstracts.kt
index 89b9ad92d0..9d21571e14 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/content/Abstracts.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/content/Abstracts.kt
@@ -118,6 +118,18 @@ sealed interface MediaCollectionContent<T: TelegramMediaFile>: MessageContent, M
 sealed interface MediaContent: MessageContent {
     val media: TelegramMediaFile
     fun asTelegramMedia(): TelegramMedia
+
+    override fun createResend(
+        chatId: ChatIdentifier,
+        messageThreadId: MessageThreadId?,
+        disableNotification: Boolean,
+        protectContent: Boolean,
+        replyToMessageId: MessageId?,
+        allowSendingWithoutReply: Boolean?,
+        replyMarkup: KeyboardMarkup?
+    ): Request<out ContentMessage<MediaContent>> {
+        TODO("Not yet implemented")
+    }
 }
 
 sealed interface SpoilerableMediaContent : MediaContent, SpoilerableData
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/content/MediaGroupContent.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/content/MediaGroupContent.kt
index 8af2a53a34..1b0c05cb53 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/content/MediaGroupContent.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/message/content/MediaGroupContent.kt
@@ -9,6 +9,7 @@ import dev.inmo.tgbotapi.types.MessageThreadId
 import dev.inmo.tgbotapi.types.buttons.KeyboardMarkup
 import dev.inmo.tgbotapi.types.files.TelegramMediaFile
 import dev.inmo.tgbotapi.types.media.TelegramMedia
+import dev.inmo.tgbotapi.types.message.abstracts.ContentMessage
 import dev.inmo.tgbotapi.types.message.abstracts.Message
 import dev.inmo.tgbotapi.types.message.textsources.TextSource
 import kotlinx.serialization.Serializable
@@ -38,7 +39,7 @@ data class MediaGroupContent<T : MediaGroupPartContent>(
         replyToMessageId: MessageId?,
         allowSendingWithoutReply: Boolean?,
         replyMarkup: KeyboardMarkup?
-    ): Request<out Message> = SendMediaGroup<MediaGroupPartContent>(
+    ): Request<ContentMessage<MediaGroupContent<MediaGroupPartContent>>> = SendMediaGroup<MediaGroupPartContent>(
         chatId,
         group.map { it.content.toMediaGroupMemberTelegramMedia() },
         threadId,