I have heaps of downloaded movies, in 2k with DTS atmos where possable and run Apple TV box connected to my atmos decoder and Samsung TV.
And this app rocks.
Supports all my movie file formats and easy loading of subtitles.
I link via cabled home network to my Mac which has 18Tb drive full of movies on it.
I tried many different playback apps.
This one is by far the best.