EbonJaeger that portal-gtk seemed *** to take care of it. great quality, no MB size.
Ironically, the terminal message stayed the same***:
$ gnome-screenshot
** Message: 18:28:39.147: Unable to use GNOME Shell's builtin screenshot interface, resorting to fallback X11.
GUI Screenshot (the gnome app) launched from app menu works like a charm. Gives you the familiar 3 options, lets you choose time and place. etc. Consider me restored. Baffled that the terminal output stayed the same before and after the ...portal-gtk
package install.
Just letting you know/FYI. Not a gripe in the least. I have the screenshot I want and need so very happy.