Viewing photos from in Apple TV
How can I view my photos stored in an External Hard Drive in my Apple TV?
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Indirectly, through Home Sharing, streamed by a computer to which the disk is connected.
Use Home Sharing to share media from a computer to other devices - Apple Support
↳ Use Home Sharing on your Apple TV
You can also view photos from your computer on your Apple TV.
• On your Mac: Choose Apple menu > System Preferences. Click Sharing. Click Media Sharing, then select Share Photos with Apple TV.
• On your PC: Open iTunes for Windows. In the menu bar, go to File > Home Sharing, then select Choose Photos to Share with Apple TV.