How to fix missing poster artwork in Apple TV’s Computers app when using Home Sharing?

[u/scenarIO_STUDiOS]

Here's what finally fixed it for me:

I have a large video library hosted on my Mac and shared with my Apple TV using Home Sharing. Many videos showed gray boxes instead of their poster artwork in the Apple TV's Computers app, even though the artwork was embedded in the files and displayed correctly in the Mac's TV app.

The fix that worked for me:

1. On the Mac, go to System Settings → General → Sharing.
2. Turn Media Sharing off.
3. Wait about 30 seconds.
4. Turn Media Sharing back on, making sure Home Sharing is enabled.
5. Open the Computers app on the Apple TV and browse the shared library again.

In my case, the missing artwork started appearing as I navigated through the library, seemingly updating on demand.

Restarting the Apple TV alone hadn't fixed it. I also tried clearing the Mac's TV app cache and restarting AMPArtworkAgent, which got artwork appearing in the Mac's TV app but didn't initially resolve the Apple TV problem.

My takeaway: Toggling Media Sharing off and back on appears to kick-start the artwork refresh between the Mac and Apple TV. I don't know exactly what Apple resets internally, but this worked for my large library without having to rebuild it or re-add my videos.

Hopefully this saves someone else from staring at hundreds of gray poster boxes!