Remove unwanted scenes from a video you recorded on
Albums screen, tap an album.
Press and hold the video you want to edit, and then tap
Drag the two trim sliders to the part where you want the video to begin and end.
As you drag a slider, you'll see time markers and video frames. The one in the middle is your start or end frame.
Tap to preview your video.
The trimmed video is saved as a new file. The original video remains unedited.