To replace the video background in Filmora for Android:
1. Open the project and import the video.
2. Tap the video clip on the timeline to select it.
3. Look for Smart Cutout in the bottom toolbar; do not look only in the Trim menu.
4. Select Remove Background and wait for the process to finish.
5. Add a new background image or video layer and place it below the cutout video.
6. If the video uses a green screen, use the Chroma Key feature.
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