Galaxy S9/S9+: How do I set a video file as wallpaper?
Step 1. On the Apps screen, tap Gallery.
Downloaded and recorded video file can be set as video wallpaper. Video file should not be over 100MB and playing time is less than 15seconds. When your device entering a lock screen mode, the video wallpaper will be played automatically. Also, you can download video wallpaper from Samsung Themes.
Step 2. Select video file what you want.
Step 3. Tap more icon and than tap Set as wallpaper.
Step 4. If video file is lager than 100MB or longer than 15seconds, tap EDIT. You can trim the video file.
Step 5. Tap set as wallpaper.
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