The message body.
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.
The recipient.
The callback for a message sending failure.
The callback of file upload completion.
The callback of a file upload error.
The callback of the file upload progress.
The callback for message sending success.
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File upload address.