If the re-scan/empty trash did not work, then Plex Dance the file. That should definitely fix things.
For best results, make sure you follow Plex naming & organization documents.
Plex Documentation → Your Media
If you’ve many movies/shows to name, there are tools that can help. Filebot is popular. The free version of Tiny Media Manager works quite well. There are many others as well.
TMM Renamer Patterns:
- Show Name:
${showTitle} (${showYear}) - Season:
Season ${seasonNr2} - Episode Name:
${showTitle} (${showYear}) s${seasonNr2}e${episodeNr2} ${episode.title} - Movie Name:
${movie.originalTitle} (${year}) {tmdb-${movie.tmdbId}}
PowerRenamer in Microsoft Power Tools is helpful for simple renaming with pattern matches or regular expressions. It makes quick work of tasks such as adding a year to file names, removing undesirable text from multiple files, etc
