A Microsoft file hosting and synchronization service.
I get this, and other OneDrive issues between Android and Windows 11 on a regular basis.
I've tried all the fixes recommended, including re-installing, turning things on and off and renaming the Camera Roll folder.
None of them work for long, but I've finally fixed it - moved to Google Drive.
Its a pity - the basics of OneDrive are pretty good but, like my vintage car, sometimes it just won't start.