Ok. So whenever I am recording Arma 3 (Either windowed or fullscreen) if the tick box for "Record System sounds" is not ticket, the sounds of Arma 3 do not get recorded.
If I do tick that box and record, there is sound but I cannot upload the video into Adobe Premiere, because it gives me some "Generic Error".
So it's either this or that.
Switching to desktop recording does the same thing. No change.