The Memories screen in the Photos app arranges photos and videos from trips, events, and other favorite moments into a short movie that you can watch on the big screen. You can’t create or edit memories on Apple TV, but you can see all the photos and videos in a timeline and skip to your favorite photos or videos during playback.
You can also set memories to appear as a screen saver on Apple TV. See select one of the following:
Add to Favorite Memories: Add the memory to your favorite memories across all of your devices. You can also Sync your iCloud photos on Apple TV