Create a trailer project in iMovie on iPhone
In iMovie, you can create professional-quality movie trailers using your own video and photos.
To create a trailer project, you first choose a trailer template. You can choose from a number of genres—for example, romance or superhero—with graphics and theme music to match.
In the Projects browser, tap the Create button , then tap Trailer.
Tap to select an iMovie trailer template (in landscape orientation, scroll to see more templates).
To preview a selected template, tap the Play button below the viewer.
The duration of the trailer appears in the lower-right corner of the viewer. The number of cast members the trailer accommodates, if any, appears in the lower-left corner.
Tap Create in the upper-right corner to create a trailer with the template that’s currently selected.