With on Apple TV.
On your Mac, choose Apple menu > System Preferences, then click Sharing.
Make sure Home Sharing and Media Sharing are selected, then enter the email address or phone number and password used to create your Home Share.
Select “Share photos with Apple TV,” then click Choose.
Click the “Share Photos from” pop-up menu and make sure your preferred photos app has a checkmark, then choose a folder to share.
Choose whether you want to share all your photos and albums or just selected albums, then click OK.
The photo albums or folders you share appear in the Computers app on Apple TV.