I use infuse, works great. If you wanna keep it simple you can just connect the app directly to a NAS or file share from your Mac, even easier than air video just set up file sharing in system settings. Works great on Apple TV and Mac also
https://apps.apple.com/us/app/infuse-video-player/id1136220934
And if you wanna get fancy down the road you can hook the app up to a Plex or Jellyfin