Plex Documentation → Your Media → Naming & Organizing TV Show Files
The most important bit in the file name is the appropriate season and episode number notation s02e17 which in this example means Season 2 Episode 17
Name your files according to Plex recommendations.
Plex Dance the entire show after renaming.
Edit:
FYI1: Case of show name does not matter. I saw it listed as “CANNAD,” but “Cannad” is OK too.
FYI2: To make testing easier, perform a partial Plex Match. Move the entire show where it cannot be seen by Plex scanners. Perform steps 2 - 4. Rename one or two episodes, then move just those episodes back. If it works, then you can rename all the episodes.
/TV Shows <-- Library points here. Exact name unimportant.
../CLANNAD
..../Season 01 <-- "Season" in English. Two digits for season number.
....../CLANNAD - s01e01.ext <-- sXXeYY mandatory. ext = mkv/mp4/etc.
