Plex Documentation → Your Media → Naming and Organizing Your TV Show Files
Name your files according to Plex documentation:
/American Horror Stories/Season 01/American Horror Stories - s01e01 - episode_name.ext
or
/American Horror Stories {tvdb-382187}/Season 01/American Horror Stories - s01e01 - episode_name.ext
If using the MP4 container, make sure any embedded metadata is correct.
Plex Dance the series after any naming & organization changes.
