A Microsoft file hosting and synchronization service.
Hi @G-S-UU
To ensure I fully understand your situation and provide the most effective assistance, I’ll need a few additional details, such as:
Could you please confirm whether the missing files were stored inside your OneDrive folder or only locally on your Mac before the sync occurred?
Also, do you see the same files when accessing OneDrive on the web?
In the meantime, you could follow the troubleshooting steps in this article: Find lost or missing files in OneDrive, to see whether you're able to locate the missing files.
Any update would be appreciated.