Post Data: session_id
The unique key returned in the initial login call.
On success, a JSON structure containing progress information.
On failure the HTTP status code will be set to something other than 200.
To determine the number of translations modified by the upload, examine the msg value returned by your progress handler.
The JSON structure will contain amongst other things, the following fields:
The unique id of the task which corresponds to a separate thread on the server. Use this id to obtain status information about the task via the remote_task_status call.
The XLIFF being uploaded must contain a unique ID linking it to a previously uploaded PDF. The PDF may be one that was uploaded during a previous session.