The file name.
The file type.
The file URL.
The session type.
The message extension.
The file object.
The input ID of the file to be uploaded.
The file name.
The sender, which can only be the current user and can not be changed.
Whether the message is a thread message.
Whether read receipts are required during a group session.
The recipient.
The message type.
The callback of file upload completion.
The callback of a file upload error.
The callback of the file upload progress.
The message body.