I am aware of the issue with mobile saves. It should be fixed in the next update. There's not currently a gallery function but it is on the to-do list, albeit a bit further down the line.
You're looking for a transparent version of the card UI button. They're hidden in the backgrounds of scenes sometimes but if you complete an episode you'll get a little sound when they appear on replays using the same save.
Yeah, At the time I just wanted to get some sex in there to spice things up a little early on but I can see that I could have done it in a better way. I have completely rewritten this scene for the upcoming full release of episode 1 in a week or two.