autoscan VS pasta

Use Cloudbox/autoscan instead. Plex Autoscan is not maintained anymore, you can see the repository is archived.

If you use *arr to manage your downloads try setting up the "Connect" section of it with Plex and only scanning when you import/add new media to save on the periodic scans for no reason, or perhaps check out https://github.com/cloudbox/autoscan as I've heard good things about this as well.

You should now use this instead: https://github.com/Cloudbox/autoscan

This tool is designed to let sonarr/radarr directly communicate with tdarr, much like autoscan is able to communicate between sonarr/radarr and plex/emby/jellyfin.

The solution to have plex refresh the metadata after a bazarr subtitle add is to use autoscan. NOT plex_autoscan, but autoscan. This is the newer version. You also need autoscan-adapter, the critical piece of the puzzle. Autoscan by itself lets bazarr/sonarr/etc notify plex to update libraries. The autoscan-adapter helps autoscan be able to actually refresh plex metadata so the new subtitles from bazarr can be found. This is all actually very easy to implement using docker-compose. Refer to the docker-compose setup in the autoscan-adapter github.

I recommand using Autoscan. If you're using the *arr stack to download your medias, it can then automatically trigger a scan. The *arr stack can do this without autoscan for jellyfin, but the advantage of autoscan is that you can plug it to any of your other means of downloading medias by just calling its webhook

My guess is that for both tracks the actual language code used is just Spanish, and it's just the title that indicates esp versus lat. In that case, since there are multiple tracks with the same language, Plex will pick the first track available. You might have to use something like PASTA or Plex Auto Languages for better control over selected audio/subtitles.

It might be easier to use something like PASTA to bulk-select the specific track you want, or Plex-Auto-Languages, which will give you a more Netflix-like experience where changing the track of one episode will go through all episodes in the season/show and automatically select a track of the same language/name if available.

I use https://www.pastatool.com/ for setting the defaults. You can chose to set which track and subtitle is the default for a show or movie.

Outside of that, you'll have to use something like PASTA or Plex Auto Languages to bulk-update the selected audio/subtitle stream.

Since you have the remux, I'd just keep that, and select the right subtitle/audio stream when playing the file back. The major benefit there is that you don't need to have two copies of the same video stream just for different audio/subtitle tracks. The major downside is that if the audio/subtitles you want aren't the default, you have to manually change it for every episode, so for the best experience I'd combine that with a third-party script like Plex-Auto-Languages (a script that will change the audio/subtitle stream for all episodes in a season/show when one changes) or PASTA (a one-time bulk operation tool).

Not within Plex itself, but you can bulk-update a subtitle track for a season/show with PASTA. Plex-Auto-Languages does something similar by changing tracks for an entire season/show if you change the track for a single episode.