I have reports that in the shell app there used to be an in-window ‘copy/paste’ menu. We are now at 2.0.13, and I’m sure that the reference to this previous capability is to v1.8.
I’ve checked using firefox and chrome, and also do not find such a menu - though I also, to be fair, do not recall a ‘copy/paste’ menu as part of the shell app.
ps I am personally relying on highlighting with the mouse to perform copy, and then either ‘ctl-v’ or right-click for paste. If there are other options, that would be great to know, too.