1: Common failure. Failed to upload a file or image.
6: The upload task is cancelled.
2: Invalid arguments.
102: The user did not call RtmClient.login, or the RtmClient.login method call does not succeed before this operation.
4: The size of the file or image to upload exceeds 30 MB.
3: Failed to upload because of timeout.
5: The number of concurrent upload tasks exceeds 9.