How to play a home video from a Mac to AppleTV
Where do the video files reside on my Mac that are are displayed on the AppleTV app under the Home Videos tab.
iMac 27″ 5K, macOS 10.15
Hover a video thumbnail in TV app and an Ellipsis ••• will show. Click on it and from the contextual menu choose Show in Finder.
If the videos were inherited from a previous iTunes library they should reside in subfolders (Home Videos and Movies) inside iTunes library folder.