Undo an action in a storyboard project in iMovie on iPhone

You can undo actions that you make when editing your storyboard project, up until the last time you opened iMovie.

In the iMovie app on your iPhone, open a 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.

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iMovie User Guide