What gallery mentioned in the changelog is it the one the phone or theres a recollection room?
I know with Joiplay's keyboard function you press P and then G and it opens a little gallery for that specific route (i.e. if you open it on the blackmail route, you only have access to blackmail scenes you have unlocked, not cuckhold or cheating). I think it's safe to say this is the case as long as you have a keyboard lol.
Pressing P will fade out to black and fade back in real quick, no worries. Then pressing G after will fade out and fade into the gallery mode.
I was told in the devs discord that there apparently isn't a function for this outside of the blackmail route but it works fine for me ok every route, it just seems to only work in certain parts, Idk (frankly I already kinda save spam for scenes for a lot of these games when they're early in developement anyways). You can the scenes you've unlock, model/clothes, the selfies/cut-in stills, and animation loops.
I put screenshots of what I mean below.