How can I copy an MP4 to my Apple TV and play it locally without the Apple TV Mac app?

I want to play an MP4 clip on loop on my Apple TV (4th gen). But I want to do this in an area where the Wi-Fi signal is spotty (ruling out AirPlay). Apparently the Apple TV Mac app [supports copying of MP4 files to the Apple TV](https://support.apple.com/guide/tvapp-mac/import-items-already-on-your-computer-atvebf18f94f/mac) , but [Catalina is required](https://www.pocket-lint.com/apps/news/apple/139717-apple-s-tv-app-explained-how-does-it-work-and-where-is-it-available) , and I have reasons not to update to Catalina. I tried [VLC for Apple TV](https://www.videolan.org/vlc/download-appletv.html) , and it performed terribly. It couldn't even cache a 100MB MP4 and loop it - kept freezing and spinning a progress wheel. (It also refuses to remember the credentials to connect to my local network, which while not a deal-breaker, is very annoying.) So what other options are there? Thanks.