(Legendas): Since legendas (subtitles) is a feminine plural noun, you would say " As legendas de Andor..."
In the context of a file name or a search result, "Andor" usually functions as the title, and "Legendas Portuguese (BR)" acts as a descriptor. If you are writing a sentence about these specific subtitles, is the most grammatically accurate choice. Andor Legendas Portuguese (BR) S01E07
The (definite article) to use for the phrase "Andor Legendas Portuguese (BR) S01E07" depends on the gender of the implied noun you are referring to in Portuguese: (Legendas): Since legendas (subtitles) is a feminine plural
(Episódio): If you are referring to the specific episode, you would use the masculine singular article: " O S01E07 de Andor..." "Andor" usually functions as the title