How to play slideshows
How do you do photo slideshows on Apple TV?
For Apple TV (4th generation) and Apple TV 4K:
1. With your photos in iCloud: Use the Photos app, select an album, select Play Slideshow.
2. With your photos in a folder on your Mac or PC, selected for Home Sharing through iTunes: Use the Computers app, select Photos, select Photos, select Play Slideshow.