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Preview your project in iMovie on iPhone
After you create your project, you can preview it either full screen or in the viewer.
In the iMovie app
on your iPhone, open a Magic Movie, storyboard project, or movie project.Do one of the following:
Play the movie in the viewer: Tap the Play button
below the viewer.Play the movie full screen: In a Magic Movie or storyboard project, tap the Full Screen button
below the viewer. In a movie project, tap Done, then tap the Play Full Screen button 
.