Import media on your Mac into the Apple TV app
In the Apple TV app on your Mac, choose File > Import.
Locate a file or folder, then click Open.
If you add a folder, all the files it contains are added to your library.
Tip: You can also drag a file or folder from the Finder to the Library window (or to the Library area in the sidebar) in the Apple TV app.
By default, the Apple TV app places a copy of each video file in the Movies/TV folder in your home folder and leaves the original file in the current location.