New 4K UHD addition to rip via #MakeMKV into #Plex is #Alien, comes with both the Theatrical and Director’s Cut. 👽 
Discussion
You putting the raw MKVs up or transcoding them to something more friendly first?
100% raw MKV rip from the UHD blu-ray.
They stream flawlessly inside our home to Infuse app.
I am going to be grabbing a Mac Mini though to upgrade my Plex server to allow it to transcode on the fly to unsupported client devices and/or outside of the home. The hardware decoding/encoding of Apple Silicon is perfect for this.