GUTLordPsymonPretty sure you can access them on the Xbox app for Windows 10 now as well.
LordPsymon is right. It's a very useful way of grabbing screenshots, recordings, etc. So if you have access to a Win10 system, give the app a try.
Yep, I can get hold of XBox screenshots just fine, but not using the iPad, that I've managed to suss that is. All my screenshots are from the XBox, although I'm a bit disappointed with the way they've changed the displaying of them via XBox Live, which means delving into F12 world and hacking the image link from the new <picture> tag they've started using.