Import into iMovie on iPhone from iCloud Drive
If you use iCloud, you can import a video clip or an iMovie project from iCloud Drive.
iCloud Drive requires iOS 8 or later, a Mac with OS X Yosemite v10.10 or later, or a PC with Windows 7 or later.
Important: If you use iCloud Photos, you can’t sync your photos or video clips using the Finder or iTunes. See Transfer media to iMovie on iPhone.
Import an iMovie project from iCloud Drive
In the Projects browser, tap the More Options button at the bottom of the screen, then tap Import Project.
Tap Browse, then navigate to the iMovie folder.
Tap the name of the project you want to import.
When the import is complete, the project opens and can be edited in the same way as any other project.