In iOS 11 and earlier, importing photos from a camera to your iPad photo library has always been a bit clunky. You plug the SD card in using the Lightning SD card reader, or the hook the camera up to the USB adapter, and then the Photos import takes over your entire screen.
Also, all the images that you import got dumped right into the main photo library, leaving you to manually select them later if you want to add them to albums. In iOS 12, though, this has all been improved. Let’s take a look: