I agree that file mgmt on the iPad can be a pain. I prefer to use 3rd party solutions - FileBrowser for Business for general file management and Photo Manager Pro for photo store and display. The latter supports folder structures and direct import/export over WiFi. I don't use the native Photos app at all.
Interesting, thanks for bringing that up. I’ll admit I use the standard photos app and it’s good enough for my use but I’ll take a look at Photo Manager Pro just to see what it offers.