Fuck Plex use Jellyin, it's actually free, libre, and open source
but now I got bangers like this saved that I can drop on my Blossom sever and post here.
https://podtards.com/c933f11533ad1853c5c154984136c1e5dba8e456ba4fe6276744fac8de77a5e0.mp4
Discussion
NAS is too underpowered for any of these so I set up a simple sever and I'm using VLC player on my AppleTV now and it's great. No fancy UI but I'm never really a fan of that stuff anyway.
VLC++