I am like you but with the Android.
Every time I use my wife iPhone I want to toss it across the room. I think primary because it doesn't have a dedicated back button.
Why is this an issue? Do you need dedicated back and forward buttons to browse through your pictures? Of course not, you just swipe left and right. That’s how the iPhone handles the “back” movement.
I just clicked on an album in "Photos", I could scroll through them swiping left and right to go through the photos but now I have to rely on the arrow at the top left of the screen to go back to view all albums. I like having a back button always present on the buttom of my screen in Android for this.
So if you've selected a photo, a swipe down dismisses the photo. From there, a swipe in from the very edge of the screen brings you out of the current album and back to viewing all albums.
I will make a video demonstrating it if you would like.
Initially, this behavior may seem weird to some from outside the iOS ecosystem? But dismissing photos by pulling down seems to be common UX with modern apps. And swiping from the side feels so natural, that apps that don't implement it (10%?) are jarring. It could be said that a weakness here is that Apple does not enforce universal usage, but most apps have implemented it well. When it does work (90%?), my thumb appreciates not having to reach the bottom left of the phone.
Sorry if it sounded sarcastic, this was a sincere question.