Please give users the ability to move or copy screens between overworld and underworld maps. It's one of those little things that as a user you don't notice initially but when you need it becomes conspicuously absent.
In the current version of NESMaker, there's a "Screen" Menu when you're in the screen editor. You can save and load screens from that menu, which works between overworld and underworld.
While your suggestion is fine for backing up purposes it's not for actual editing work. It's still a hassle to work the menus for something that could be done quickly with standard keyboard shortcuts. Some clipboard ability is already there but it is limited to the particular map control where the clipboard command was executed. If there are technical limitations as to not being able to share the clipboard between map controls then I also suggest having a button on the upcoming toolbar for moving screens back and forth.
This is something that I really should have added a while ago. I just added this as a feature request for version 4.1. I'll try and get this in there. Thanks!
In the current version of NESMaker, there's a "Screen" Menu when you're in the screen editor. You can save and load screens from that menu, which works between overworld and underworld.
didn't realize that! came here trying to figure out how the tile copy/paste is supposed to work (Joe did it in the Adventure mod tutorial). Holding shift down and Ctrl-C seems to get the Copy but I can't get the Paste to work....
But the save/load screen is actually even better! I'll just use that from now on, thanks chronosv2!
The CTRL+C and CTRL+V works fine, for screen in the same map, just do it slowly
And I heard it will work between overwold/underworld too, in the new version