A Microsoft file hosting and synchronization service.
Hello,
Before we can start digging for a fix, I need to get a better picture of what is going on locally on your phone and how the link was severed.
When you mention the synchronization was cancelled, did you go into your account settings and completely unlink the Samsung account from your Microsoft account, or did you simply flip the switch off for camera upload in the OneDrive app itself?
It would also be super helpful to know if you already peeked into the local trash bin right inside the Samsung Gallery app on your phone. Sometimes when the sync breaks or is disconnected abruptly, things can get moved to the physical device trash rather than the online cloud recycle bin you already checked.
Get back to me with those details and we will figure out where to look next.