Plex-Auto-Languages VS PlexAutoSkip

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 prefer plex-auto-languages personally because it’s automatic. You run it locally, and it monitors your TV show usage on Plex. When you play a TV episode with specific audio/subtitle settings, plex-auto-languages notices that and applies those same settings to every other episode in the show.

Sure here you go: https://github.com/RemiRigal/Plex-Auto-Languages

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).

Original is here, I did next to nothing, all credit goes to them.

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.

If you don't have a Plex Pass, you could look into PlexAutoSkip's option to add your own custom markers. This won't show a 'skip' button, but will automatically skip that portion. The downside is that the script only works for local playback, and on clients that can "advertise as player"

There are ways to control playback of devices within the same local network using the Plex API (things like Plex Auto Skip use this), but it's not something built in to Plex.

I love the new Plex skip credits feature. This feature + PlexAutoSkip is a killer combo. But, sometimes the tool Plex uses to discover the credits, and sometimes the intro is off. How do you edit the markers for Intro and Credit sections?

Plex basically killed https://github.com/mdhiggins/PlexAutoSkip

PlexAutoSkip works very well.

It's not possible to auto-skip, though there have been signs that it's being worked on (a short-lived Android setting that seems to have been pulled: https://i.imgur.com/nIEubTs.png. That doesn't mean it will ever see the light of day though. The best you can do right now is to use Plex Auto Skip, though it has some limitations due to how Plex's playback controls work (has to be local, and the client has to advertise that it can be controlled by an external device).