This is covered in the official documentation https://support.plex.tv/articles/naming-and-organizing-your-tv-show-files/
My personal advice: split the file. [HowTo]: splitting multi-episode files with MKVtoolnix GUI
This is covered in the official documentation https://support.plex.tv/articles/naming-and-organizing-your-tv-show-files/
My personal advice: split the file. [HowTo]: splitting multi-episode files with MKVtoolnix GUI