Solution at the bottom
Server Version#: 1.21.2.3943
Player Version#: N/A
I’ve added a handful of “Adult” shows which don’t exist within TheTVDB to a separate library, however many aren’t recognized, even as “unmatched” shows, within Plex.
There are 11 shows total, but only 4 are recognized by Plex
I can see the folders for the shows when I switch from “TV Shows” view to “Folders” view, but even in “Folders” view, it doesn’t even see the media files. The files are mostly MP4 format, and they play fine in the native Windows player.
I’ve tried moving files out, scanning the library, analyzing the library, refreshing metadata, optimizing database cleaning bundles, moving files back in, the entire “Plex Dance”, and no result.
SOLUTION!
After doing the Plex Dance, I tried renaming all the files as S##E## and it recognizes them now. Gotta stick to those naming conventions!