Hello Jazzeyfae503,
Thanks for reaching out to Apple Support Communities.
To help view your iMovie project on all your devices, you can move the video to iCloud Photos. iCloud Photos must be enabled before this step can be done. Learn what to do if you don't use iCloud Photos.
To help move the video to iCloud Photos on your Mac, follow the steps below:
- "In iMovie, choose Window > Go to Theater.
- Click a video to select it, then click the Share button , then choose File.
- Click the Resolution pop-up menu and choose the highest resolution available. Set the other share options, then click Next.
- Choose a location on your Mac to save the video, like the Desktop, then click Save.
- Open Photos.
- Find the saved video file on your Mac, then drag it into Photos.
- Repeat for every video you want to copy to iCloud Photos.
"
This information is from Move iMovie Theater content to iCloud Photos - Apple Support.
Regards.