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 From the Home screen, swipe up and then find and tap Photos. 
- Tap a video thumbnail to view it in full screen.
- Tap  , and then drag the trim sliders to the part where you want the video to begin and end. , and then drag the trim sliders to the part where you want the video to begin and end.
- Tap  to preview your trimmed video. to preview your trimmed video.
- Tap Save.
The trimmed video is saved as a copy. The original video remains unedited.