Sync your iCloud photos on Apple TV
The first time you open the Photos app on Apple TV, you’re prompted to sync all your iCloud photos or only your Shared Albums. You can change which photos are shared at any time in Settings.
Go to Settings
on Apple TV.
Go to Users and Accounts > [default username], then select Photos.
Select iCloud Photos to turn it on or off.
When you turn it on, you’re prompted to confirm on another Apple device.
Note: Only the default user on Apple TV can sync their photos and view content in the Photos app. See Change the default user on Apple TV.
iCloud Photos automatically stores your full-resolution photos and videos in iCloud. iCloud Shared Photo Library lets you share photos and videos seamlessly with up to five other people (separate setup is required on an iPhone, iPad or Mac). You can access iCloud Photos and Shared Photo Library from any device using the same Apple Account.
You can’t edit photos and videos on Apple TV, but you can use the Photos app on iPhone, iPad or Mac to edit them and have those changes automatically update on Apple TV and all your other devices.