The menu app on MacOS has a nice screen shot button, but I pretty much never want an entire screenshot in there. I almost always want a screen selection only.  For example, I use CMD+CTL+SHIFT+4 to capture a screen selection with an area selection tool, which copies to clipboard and I paste that image in other apps.  I'm not able to paste that image into the menu app.  Actually, I just tested, I cannot paste into the main Notebook app either.  This would be extremely helpful.