The tasks below describe different ways to transfer media to your device’s photo library so that the media appears in the media browser.
You can use iCloud Photos to transfer items between iOS devices. For example, if you take a picture on your iPhone, the photo automatically appears on all your other devices that have iCloud Photos turned on.
Important: iCloud Photos requires that you have iCloud set up and are using iOS 8.3 or later. When iCloud Photos is turned on, you can’t transfer your photos or video clips using iTunes.
On each device, go to Settings > [account name] > iCloud, and make sure you’re signed in to iCloud with the same Apple ID.
In iCloud Settings on each device, tap Photos, then tap to turn on iCloud Photos.
Open iMovie for iOS, then open a project for editing.
Video clips or photos that are stored in iCloud but are not on your device appear in the media browser with a cloud icon 
. Tap the video clip or photo to download it to the photo library on your device.
For more information, see Add video clips and photos.
Important: If you use iCloud Photos, you can’t transfer your photos or video clips using iTunes.
Connect your device to your computer, then open iTunes on your computer.
After a moment, your device appears in iTunes in the Library window.
Click the device’s button at the top of the iTunes window.
Select Photos in the sidebar on the left.
Select Sync Photos, then choose an album or a folder from the pop-up menu.
On a PC: You can also choose Photoshop Album or Photoshop Elements to export photos directly from those applications to your device.
On a Mac: To export photos from Photos, iPhoto, or Aperture to your device, choose Photos, iPhoto, or Aperture.
Select one of the following to control which photos are transferred:
All photos and albums: Transfers all photos and albums to your device.
Selected albums: Transfers the albums, events, or folders that you select.
If you chose “Selected albums,” select the items you want to transfer in the lists that appear.
Do any of the following:
Include only photos and video clips you’ve marked as favorite: Select “Only favorites.”
Include video clips: Select “Include videos.”
Include recent photos and video clips: Select “Automatically include photos from,” and choose a time range from the pop-up menu.
Click Apply.
When the transfer is complete, the video clips and photos are available from the media browser within iMovie.
You can edit media used in projects that have been shared between devices in the iMovie Media section of the media browser. There you can download the media to your Photos library, or delete the media from the current device.
Note: Media from projects created in previous versions of iMovie can also be managed this way.
In the Projects browser, tap a project, then tap Edit.
Tap the Add Media button 
, then tap Video.
Tap iMovie Media.
Any video clips that are not already saved in your Photos library appear.
Tap Edit.
Buttons appear at the right side of each clip.
Do any of the following:
Save a clip to your Photos library: Tap its gray Download button 
.
Remove a clip from your device: Tap its red Delete button 
.
Note: If the clip is currently used in a project, you must remove it from the timeline before deleting it. See Remove a video clip or photo from a project.