Apple TV for home movies with home sharing flawed

Thanks for the reply. I figured there had to be some issue with the compatibility of the files between the Apple TV app on the computer and the Apple TV 4K on the TV. I'll have to dive into the technical aspects of my video files and ensure I have the most compatible format. I'll update what happens.

UPDATE:

I had to save videos through a media encoder (I used Adobe Media Encoder, part of Creative Cloud).

Default format: H.264

Default preset: Match Source - High Bitrate (did not work)

– Tried preset: H.264 Match Source - High Bitrate (did not work)

– Finally tried preset: High Quality 1080p HD and High Quality 2160p 4K (success!)

Although Apple stated that formats .mov, .mp4, and .mv4 were compatible to Apple TV. This was only true for the Apple TV app on my computer, but only .mp4 showed up on the Apple TV 4K for TV. Unfortunately, those .mp4 videos were not playable until I processed them through a media encoder with the below settings.

Adobe Media Encoder Settings

Default format: H.264

Default preset: High Quality 1080p HD and High Quality 2160p 4K

Note: I still cannot see my shared home videos on my other Mac or iPhones / iPads. This makes me wonder if when home videos are added to an Apple TV app on one device they stay local to that device through the Apple TV app. So essentially, the home sharing of home videos only works from a single device through the Apple TV app to be shared with the Apple TV 4K box, not to another device using the Apple TV app. Multiple devices can share their local home videos to the Apple TV 4K box. Each device shows as a different source. I believe if you purchased movies / TV shows through Apple, those would show up on all devices (ex, your wife bought a movie, it would be shared with everyone in the shared network).