Within the Shortcuts app (https://itunes.apple.com/us/app/shortcuts/id915249334?mt=8), add the shortcut for deleting the screenshots from the Gallery to your library. You can then access it within the shortcut app, widget or add a Siri command (maybe I'm wrong as I don't use Siri). It takes you to a screen with all your screenshots, you select the ones you don't want to keep and voila.What is the shortcut? And how do you do it?
This actually sounds really nice. Another possible method that would be better than what we currently have would be 3D touching with two fingers.The screenshot method on the Huawei P20 Pro is the easiest and quickest and never gives unwanted screenshot.
Just knock the screen with a knuckle twice.
And deleting a screenshot after is equally easy. Just tap File Manager icon on homescreen and you are in the screenshot folder after two quick additions icon taps.