to Sent Media Group Update
fun List<BaseSentMessageUpdate>.toSentMediaGroupUpdate(): SentMediaGroupUpdate?
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Receiver
List of BaseSentMessageUpdate where BaseSentMessageUpdate.data is MediaGroupMessage and all messages have the same MediaGroupMessage.mediaGroupId
Return
MessageMediaGroupUpdate in case if first object of this is MessageUpdate. When first object is ChannelPostUpdate instance - will return ChannelPostMediaGroupUpdate. Otherwise will be returned null