So Kino is an app you install on your TV and it works like a media server with a decent video player(subtitles, audio streams, playback speed, continue from last position). It uses the internal TV storage + a USB storage you can plug.

Then you have the iOS and macOS apps that you can use to upload your videos to the TV. Other than uploading and file management, you can control the playback and stream the videos from the TV back to the iOS and macOS app and even switch the playback back and forth between the large screen and the iOS/macOS device like with handoff.

It works pretty well.