So as seen, in the image, this is the file structure for my personal FMA B blu ray rips, which I added an hour ago. However episodes 1-9 are not listed, but it picks up 10-64. What I do not understand is how it’s missing 1-9.
I’m actually surprised Plex picks up any of those…
You should try to stick with the Plex naming schema to avoid such troubles. In particular with TV shows where Plex can be particularly picky.
Even if you use Absolute Order, Plex considers all episodes to be part of a single season. This is also useful if you want to add some specials further down the road.
One addition:
Plex usually ignores all content in a TV show library that doesn’t contain certain naming elements (usually this is the sXXeYY pattern showing the season XX and episode YY).