I put a critical severity as the one error filled our Sentry quota in only one hour.
Sentry Issue: NUXEO-DRIVE-2MQ
This is happening on Windows when a synchronized file is being modified. The OS will refuse modifications because either the file is opened by another software or the file is not fully written to the file system.
Drive understands the case but still tries to set the remote ID in extended attributes, because the sooner the better.
Let's skip that specific error and let's Drive retry later.