Hello everyone,
I have been using Plex for a while now with very good results, I have my media server running on Ubuntu 18.04, and my players are rasplex and android with chromecast.
I have two external disks:
Samsung 500 gb 100% movies.
Toshiba 1TB 25% movies 25% series 50% empty.
I used subtitles for both Opensubtitles and Subzero, with different results, for example at the beginning I could not get the subtitles for the series, with the movies I got the subtitles in Spanish which is what I want, now the series sometimes do not have subtitles or they come in English.
The information of the films is in Spanish which is correct but the posters also and I prefer that they be kept in the original language.
**What I need is to get an optimal configuration and that is set as follows:
Films and Series subtitles in Spanish.
Films and Series All the information in Spanish.
Movies and series Poster in English or in the language of origin.
**
I've tried several configurations so much that now I'm not sure which one is going to work correctly and I'm afraid it will not work correctly ... it happened to the point that I could not see the subtitles. 
Maybe it's a silly problem but I would appreciate a help.
Thank you very much 