If you recorded video using an iPhone 7, iPhone 7 Plus, iPad Pro (10.5-inch) , or iPad Pro (12.9-inch, 2nd generation) with iOS 11, and then try to import the video into Final Cut Pro X 10.3.4:
- Clips might appear black in the Import window.
- Clips might appear to be successfully importing in the Background Tasks window.
- A camera icon might appear on the bottom-left corner of a black clip after attempting to import it into an Event.
Update to Final Cut Pro X 10.4 and reimport the media.