SENT - The transfer has been sent successfully, but has not yet been accepted on the receiving device.
FINISHED - The transfer has completed, and has downloaded successfully on the receiving device.
PAUSE - The transfer can be paused indefinitely until it is restarted at a later time.
RESUME - The transfer can be resumes after it was initially paused.
ACCEPT - The transfer can be accepted in order to begin receiving a file.
CANCEL - The transfer can be rejected before accepting or canceled after it has started.
CANCELED - The transfer was canceled manually. It cannot be restarted.