View Source ExTDLib.Method.EditMessageMedia (ExTDLib v0.0.4)

Edits the content of a message with an animation, an audio, a document, a photo or a video, including message caption. If only the caption needs to be edited, use editMessageCaption instead. The media can't be edited if the message was set to self-destruct or to a self-destructing media. The type of message content in an album can't be changed with exception of replacing a photo with a video or vice versa. Returns the edited message after the edit is completed on the server side. Returns object_ptr<Message>.

NameTypeDescription
chat_idstringThe chat the message belongs to.
message_idstringIdentifier of the message.
reply_markupReplyMarkupThe new message reply markup; pass null if none; for bots only.
input_message_contentInputMessageContentNew content of the message. Must be one of the following types: inputMessageAnimation, inputMessageAudio, inputMessageDocument, inputMessagePhoto or inputMessageVideo.

More details on telegram's documentation.