For as long as I have had the Apple TV I could view photograph files held on my previous IMAC. These files comprise some photograph files held in the Pictures folder. IE "Amsterdam 2003". They number around 10000 photographs. By setting up Home Sharing the pictures could be watched on the lounge tv via the Apple TV using my last iMac.
Re downloading File Explorer my Apple Tv has no option to download any software applications, other than updating its own software.
My new Mac Mini has Big Sur. And in some aspects the Apple Tv does communicate with the Mac Mini. The Mac knows the ATV is on the network. When I go into the Computers icon on ATV I can play Music, watch some Home Movies, but under Photos there is nothing yet I have some 2400 photographs in Apple iCloud Photos.
When I go into the ATV Photos App I can see 7 Shared Albums but not the 2400 photographs held in my iCloud Photos library. The Shared albums viewable on the ATV are a part of that Library.
It's model number is A1469, Software 7.6.2 (8144 which I think must make its Generation 2.