I am playing with “spies in disguise” Blu-ray iso file. The correct title is not the default one. When switching to the right title number, I can only choose the default subtitles. I can not select opensubtitles subtitle.
Infuse on iPhone has the same issue.
Also, the same file name with srt extension did not work.
I think these should all work even when playing a title other than the default.