OneDrive has been showing Processing changes for two days. The cloud icon never goes away and a few files do not sync. Windows 11. How can I fix it?

Work through these in order.

1. Pause and resume sync from the OneDrive icon in the taskbar.
2. Look for files with names that OneDrive does not accept, like ones that end in a dot or contain * : < > ? / \ |. Also check very long paths. Rename or shorten them.
3. Make sure you have not hit the storage limit.
4. Reset OneDrive. Press Win + R and enter %localappdata%\Microsoft\OneDrive\onedrive.exe /reset. The icon disappears and returns after a minute. If it does not return, start OneDrive from the Start menu.

A reset does not delete your files. It just makes OneDrive check everything again, so the first sync takes a while.

Found two files with a trailing dot in the name. Renamed them, ran the reset, and OneDrive finished. Thanks.