Hi -- I am looking to understand this too.
I am on iOS 15.3.1, using VLC Remote Pro and everything connects OK. Can play/pause etc.
videos just fine. But want to be able to turn subs on/off to select
which subs file to use, whether embedded to external .srt.
But, not sure what you mean by swipe up on the cone? On the control tab, there is only one cone (see attached screenshot) and that does not appear to swipable in any direction.