I was using Airplay just fine from my iPhone to Apple TV as well as mirroring from desktop Now all I get on Apple TV when I select a home movie is a spinning wheel.
When attempting to stream home movies from either my iPhone or desktop, all I get on the Apple TV is a spinning wheel. The TV screen shows the item I'm attempting to stream, but it doesn't play.
iMac 27″ 5K, macOS 11.0