Thumbnail of the cover for the album; pass null to skip thumbnail uploading.
Audio file to be sent.
Audio caption; pass null to use an empty caption; 0-getOption("message_caption_length_max") characters.
Duration of the audio, in seconds; may be replaced by the server.
Performer of the audio; 0-64 characters, may be replaced by the server.
Title of the audio; 0-64 characters; may be replaced by the server.
An audio message. Subtype of InputMessageContent.