That is right.I noticed that some Netflix Chinese subtitles are not even text based. In the recent series Clickbait, they are VOBSUB, which is to say image based DVD style.
Netflix - Minions, external SRT sub option elected. SRT file attached. Non-issue for Disney Plus
For Chinese, Japanese, Vietnamese, ... you need to select "embedded subtitles" in the options, they will not work as external files, obviously. Embedded subs are cleaner anyway, one mp4 file, all content.
AnyStream normally shouldn't extract the image style subs to srt at all - recent changes to the subtitle engine seem to have removed that lock.
Even if it might be possible, it would clutter the UI (settings) and confuse people, which the devs want to prevent.I don't know if you guys can fix the download of separate subtitles for Vietnamese?