Hi @oma2000,
The tmpXX files are not created by odrive, but Microsoft will create temporary files during the upload process and then rename them after completion. The temporary names vary, depending on the service.
It sounds like the file may be uploaded completely and then Microsoft is rejecting the final “commit” of that file.
Are you able to upload one of these files from their web client?
Can you send a diagnostic from the odrive tray menu, so I can take a closed look?