Apple TV - home videos in library

What is your model Apple TV? Identify your Apple TV model - Apple Support

Are you trying for Home Sharing from a home-networked computer, or are you trying for home videos in iCloud?

Home Sharing videos are found in the Computers app on Apple TV, not in the TV app.

Ensure Home Sharing is working on both the computer and the Apple TV. Please refer to the help in Troubleshooting Home Sharing