

iMovie first began supporting 4K video editing with the 2.2 update released in September after the launch of the iPhone 6s and the iPhone 6s Plus. The two new iPhones are the first Apple devices that are capable of capturing 4K video, and along with the iPad Pro and the iPad Air 2, they're also the only devices that can edit 4K video.
Today's 2.2.1 iMovie update also includes several fixes for bugs that were discovered after the major 2.2 September update.
iMovie can be downloaded from the App Store for $4.99. [Direct Link]What's New
- Create and share movies at 4K resolution on iPad Air 2 with iOS 9.1*
- Fixes an issue that could prevent users from creating new trailers in some languages
- Resolves issues importing and removing projects from iCloud Drive
- Addresses interface issues that could appear in some right-to-left languages
- Addresses interface issues that could appear in iMovie extension for Photos
- Performance and stability improvementsiMovie supports 4K on iPhone 6s, iPhone 6s Plus, iPad Air 2, and iPad Pro
Article Link: iMovie Updated With 4K Support for iPad Air 2 on iOS 9.1