Trimming a video is a cropping of the playback time.
On the trimming screen, adjust the slider to determine the trimming range.
If you can adjust the trimming range to some extent with the slider, make fine adjustments with +-.
Once the trimming range is decided, trim with “Trim”.
After trimming, use “Done” to range the trimming.
For saving the trimmed video, see “Saving video“.