Ok, that means Plex cannot “match” it to any tv show in its online media databases.
Plex doesn’t read episode titles from the file names.
However the files being in mp4 format is a boon in this case.
You can embed the episode titles into the files as “Title” meta tags, from where Plex can read them in turn.
If all files follow the above naming schema, this is less laborious than you might assume.
You can tell Mp3tag - the universal Tag Editor (ID3v2, MP4, OGG, FLAC, ...) to parse the file names (of all episodes at once) and then extract the episode title after the second dash and write it into the Title tag.
The feature is called Convert > File to Tag
and the parser string should be working with %dummy% - %dummy% - %title%
