Recently subtitle offset was added to Plex and it has been a savior for me. However, because not all codecs are supported equally, particularly on Plex apps found on smart TVs and game consoles, there can occasionally be files that do not play audio in sync with the video. This is not a problem on PC, where codec support is much more robust. The solution to the problem is simple:
Lets add Audio offset controls in the Plex app to compensate for imperfect codec support.