real fix:)

TelegramBotAPI-extensions-api/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/extensions/api/stickers/SetStickerSetThumb.kt

@@ -1,4 +1,4 @@
-package com.github.insanusmokrassar.TelegramBotAPI.extensions.api.stickers
+package com.github.insanusmokrassar.TelegramBotAPI.extensions.api.thumbs
 
 import com.github.insanusmokrassar.TelegramBotAPI.bot.RequestsExecutor
 import com.github.insanusmokrassar.TelegramBotAPI.requests.abstracts.FileId
@@ -10,65 +10,65 @@ import com.github.insanusmokrassar.TelegramBotAPI.types.stickers.StickerSet
 
 suspend fun RequestsExecutor.setStickerSetThumb(
     userId: UserId,
-    stickerSetName: String,
+    thumbSetName: String,
-    sticker: FileId
+    thumb: FileId
 ) = execute(
-    SetStickerSetThumb(userId, stickerSetName, sticker)
+    SetStickerSetThumb(userId, thumbSetName, thumb)
 )
 
 suspend fun RequestsExecutor.setStickerSetThumb(
     userId: UserId,
-    stickerSetName: String,
+    thumbSetName: String,
-    sticker: MultipartFile
+    thumb: MultipartFile
 ) = execute(
-    SetStickerSetThumb(userId, stickerSetName, sticker)
+    SetStickerSetThumb(userId, thumbSetName, thumb)
 )
 
 suspend fun RequestsExecutor.setStickerSetThumb(
     user: CommonUser,
-    stickerSetName: String,
+    thumbSetName: String,
-    sticker: FileId
+    thumb: FileId
 ) = setStickerSetThumb(
-    user.id, stickerSetName, sticker
+    user.id, thumbSetName, thumb
 )
 
 suspend fun RequestsExecutor.setStickerSetThumb(
     user: CommonUser,
-    stickerSetName: String,
+    thumbSetName: String,
-    sticker: MultipartFile
+    thumb: MultipartFile
 ) = setStickerSetThumb(
-    user.id, stickerSetName, sticker
+    user.id, thumbSetName, thumb
 )
 
 suspend fun RequestsExecutor.setStickerSetThumb(
     userId: UserId,
-    stickerSet: StickerSet,
+    thumbSet: StickerSet,
-    sticker: FileId
+    thumb: FileId
 ) = setStickerSetThumb(
-    userId, stickerSet.name, sticker
+    userId, thumbSet.name, thumb
 )
 
 suspend fun RequestsExecutor.setStickerSetThumb(
     userId: UserId,
-    stickerSet: StickerSet,
+    thumbSet: StickerSet,
-    sticker: MultipartFile
+    thumb: MultipartFile
 ) = setStickerSetThumb(
-    userId, stickerSet.name, sticker
+    userId, thumbSet.name, thumb
 )
 
 suspend fun RequestsExecutor.setStickerSetThumb(
     user: CommonUser,
-    stickerSet: StickerSet,
+    thumbSet: StickerSet,
-    sticker: FileId
+    thumb: FileId
 ) = setStickerSetThumb(
-    user.id, stickerSet.name, sticker
+    user.id, thumbSet.name, thumb
 )
 
 suspend fun RequestsExecutor.setStickerSetThumb(
     user: CommonUser,
-    stickerSet: StickerSet,
+    thumbSet: StickerSet,
-    sticker: MultipartFile
+    thumb: MultipartFile
 ) = setStickerSetThumb(
-    user.id, stickerSet.name, sticker
+    user.id, thumbSet.name, thumb
 )
 

TelegramBotAPI/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/stickers/SetStickerSetThumb.kt

@@ -7,22 +7,18 @@ import com.github.insanusmokrassar.TelegramBotAPI.types.*
 import kotlinx.serialization.*
 
 fun SetStickerSetThumb(
-    stickerSetName: String,
     userId: UserId,
-    sticker: InputFile
+    stickerSetName: String,
+    thumb: MultipartFile
 ): Request<Boolean> {
-    val data = SetStickerSetThumb(userId, stickerSetName, sticker as? FileId)
+    return CommonMultipartFileRequest(
-    return when (sticker) {
+        SetStickerSetThumb(userId, stickerSetName),
-        is MultipartFile -> CommonMultipartFileRequest(
+        mapOf(thumbField to thumb)
-            data,
-            mapOf(thumbField to sticker)
     )
-        is FileId -> data
-    }
 }
 
 @Serializable
-data class SetStickerSetThumb internal constructor(
+data class SetStickerSetThumb (
     @SerialName(userIdField)
     override val userId: UserId,
     @SerialName(nameField)