Home Sharing home videos.
Recently added imported some new home videos to TV app/library on iMac. My old videos can be watched on other devices (AppleTV/iphones) via Home Sharing, the new ones aren't there.
iMac, OS X 10.11
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Use Home Sharing to share media from a computer to other devices - Apple Support
On iPhone, Home Sharing files appear in the TV app. With iOS 15 Home Sharing libraries, home videos are lumped in with movies.
On Apple TV, Home Sharing files appear in the Computers app (not the TV app!). With Home Sharing libraries, Home Videos have their own tab or sub-tab.
Some content may be compatible with your Mac, but not compatible with Apple TV or the player of the Computers app. The media files have to be compatible with all. For best compatibility, use .mp4/.m4v/.mov format files with H.264 video and AAC audio. Imported incompatible files should still show, but may not play.
New additions should be live updated across devices, but if it doesn’t show, then restart those devices.