Photos App not grouping photos

Hi,

recently I've made the transition towards ios, however I'm still encountering some issues, most importantly the user of the stock gallery app. Thing is, my library is sizeable, roughly 90gb of mostly pictures. Issues is, it's grouped in several riders, from the DCMI folder on my old Pixel device, to documents and whatever was in my download folder, which right now all sits together in a total mess.

The prices was initially done through the move-to-ios Android app. Then I've tried using the Google photo app only; following this I've tried deleting and downloading from the Google photo app, rendering the same result.

I am aware of the possibility of making folders, however it's there a way of making apps save files to those albums only, or do I have to repeat this process indefinitely ? The fact that the original photo still remains in the main album is also a significant impediment.

And so, is there something that I've missed, or so I simply have to get used to this ? The iPhone's high storage capacity was the deciding factor in three purchase, and as if right now this issue is off so much importance to me that I'm willing to ditch the phone and return to the old one.

Thank you for your time.