0x80070194 – Cloud file provider terminated unexpectedly

A cloud sync program has stopped or stopped responding.

Stop using a drive with unusual noises, read errors or data loss. Do not format, initialise or repair speculatively; seek qualified recovery advice.

Reopen the associated cloud app and check its status.
Save work, restart Windows and update the cloud app from official source.
Additionally check important files via the cloud website. If changes are not synchronized, do not delete folders or reset the service carelessly.

Test after each step and stop when the issue is solved. Checkmarks are not permanently saved.