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Fill storyboard placeholders in iMovie on iPhone
When you create a storyboard project in iMovie, the storyboard you choose includes a shot list with placeholders of clip groups to guide you in choosing which video clips or photos to add. You can add video clips and photos from your library or record new video or photos directly into placeholders. After you add a video clip or photo to a placeholder, you can use the iMovie editing tools to edit the clip, just as you can in a Magic Movie or movie project.
After you add a clip to a placeholder, the Add button in the top-left corner of the thumbnail no longer appears. To make changes to the clip, see Edit clips in Magic Movies and storyboard projects in iMovie on iPhone.