Photos displayed sideways
I am using iTunes Home sharing Photos to view on Apple TV
Some photos are displayed sideways when playing back on Apple TV but orientation is correct in Photos on My Mac Pro
Photos taken with iPhones (different generations)
What is the model Apple TV?
Identify your Apple TV model - Apple Support
Find your Apple TV model number - Apple Support
I can’t replicate this issue with Apple TV 4K (A1842) and photos from iPhone 12 mini, taken in all of the four orientations.