By A Mystery Man Writer
You can set a video as wallpaper on most Android devices by using one of several free apps, depending on the device you own.
How to Use Videos as Live Wallpaper on Android
Set Live Wallpaper Lock Screen (30 + Background Pictures)
How to set a video as your wallpaper on your phone screen - CNET
How to Set Video or GIF as Wallpaper on Your Android - TechWiser
Download Free 100 + the office android Wallpapers
Here's how to set an animated GIF or an MP4 video as a moving wallpaper on Android - PhoneArena
How To Make Video Wallpaper Discounts Outlet
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How to Make Live and Video Wallpapers on Android - Make Tech Easier
Feedback for OneUI 6 (or maybe later updates of OneUI 5?): please add ability to set a video/GIF as a background for homescreen : r/oneui