iMovie only supports a 16:9 aspect ratio, so it can’t be used for editing vertical short-form videos or projects in common ...

In this video, I'll show you everything you need to know to edit a video project with iMovie from importing videos and photos to exporting and sharing the video via YouTube or email. 1.

1. Start the iMovie app and if you see the Welcome screen, tap "Continue." 2. On the Projects page, tap the plus sign to start a new movie. 3. On the New Projects pop-up, tap "Movie." 4.