PUT /uploads/(uid)/files/(fid)/parts/(pid)
Upload a file (or part of a file) as part of an upload session created with POST /uploads.
Use the “pid” and “fid” parameters to specify that the data being uploaded is for part $$M$$ of file $$N$$. To upload a file from the client, specify the “file” parameter. To upload a remote file, specify the “sid” and “path” parameters with a session id and remote filepath for the file to upload.