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Undo or redo an action in a Magic Movie or storyboard project in iMovie on iPhone
You can undo or redo actions that you make when editing Magic Movie and storyboard projects, up until the last time you opened iMovie.
In the iMovie app
on your iPhone, open the Magic Movie or storyboard project.
Do one of the following:
Undo an action: Tap the Undo button
at the top of the screen.
Redo an action: Tap the Redo button
at the top of the screen.