From experience I would say things will be much smoother and easier once you figure out how to properly prepare your media (specifically the naming / folder organization part).
Based on BigWheel’s feedback… did you not only fix the release year but also the actual show name (e.g. to avoid it being mismatched with some other shows)?
The following structure should be working:
séries
divx <- folder linked to your tv-show library
Oui-Oui (1998)
Season 01
Oui-Oui (1998) - s01e01.ext
Oui-Oui (1998) - s01e02.ext
Where .ext is a placeholder for your actual file extensions.
If the show has a hard time to be matched you could include a reference to the ID of the show in its folder, e.g.
Oui-Oui (1998) {tvdb-76491} <- ID from TheTVDb.com
Oui-Oui (1998) {tmdb-67448} <- ID from The Movie Database
Oui-Oui (1998) {tt0199253} <- ID from IMDb (no "imdb-" prefix needed)
For any naming fixes to take effect, you might need to do a Plex Dance (silly name, but very helpful procedure). Plex remembers files by a number of characteristics, not just the name… so if the files have been mismatched and you fix the names, Plex might stick with the old match to “protect you” from accidentally mixing things up.
The Plex Dance consists of (1) moving the files out of the series folder, (2) scanning your library, (3) emptying the library trash / cleaning the server bundles, (4) returning the files to their target folder/naming and finally (5) scanning the library ones more.
If fixing the names doesn’t show those files at all… what type of files are those missing Oui-Oui episodes? Plex will ignore certain formats it doesn’t support (e.g. ISO disc images).
