It's easy! All you have to do is tap the little PiP (picture-in-picture) box that appears in the bottom left corner of your iPad's screen right after you take a screenshot.
With Instant Markup, you can access your screenshots immediately after you've taken them, and even mark them up before shipping them off to their final destination. We also send them through the wringer, marking them up, slapping arrows and cutouts on them, really giving them the run-through. Around here, we take a lot of screenshots, and I mean a lot.