The problem occurs because of a conflict with the VHD file that is created by Windows Backup and is mounted during the process. There are three types of VHD files here— Fixed, Expandable(Sparse), and ...

Stop fighting with your PC just to set a wallpaper; Windows 11 is finally embracing WebP files natively.

Microsoft is also thought to be testing video backgrounds, but that's still missing from the latest preview build.