Windows 10 – Icons Missing from OneDriver Folders

Windows can only handle 15 overlays.

Bring up the registry (regedit.exe) and navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers

Delete unwanted overlays until there are only 15 left. In my case, I have DropBox also. I simply deleted DropboxExt6 through 10.

Reboot your computer.