When it next does that to you check the command line to see what CC3+ is doing. It may be that you haven't finished a command.

There could be other causes, of course, but that's always the first place to look for clues.

At the point in the process where you right click (after you have picked Copy from the Edit menu) you should get this pop up

The Window option is 6th in that list. Pick it and then continue with the process. I think the bits you don't understand will become clear to you once you start with the Copy tool in the Edit menu.

If it doesn't, just say.

Very generally they all go in the ProgramData\Profantasy\CC3Plus\Bitmaps\Tiles folder, but there is a well developed structure in that main folder, as you can see below.

The annuals each go in one of these subfolders (above) according to what basic type they are - overland in the Overland folder, dungeon styles in the Dungeon folder, etc.

These are all the annuals in the Bitmaps\Tiles\Overland folder - all the overland annuals are there in their named subfolders.

Perhaps it's worth noting here (although it wasn't part of your question), that we encourage all user-generated fills to be put in a folder called USER placed in the Tiles folder, rather than scattered all over the place within the subfolders. It's a lot easier to copy your stuff and keep it safe if you get a new PC or have to do a major uninstall reinstall at any point.

Thanks for letting us know this, Wyvern. I will draw Ralf's attention to this thread for you.

I can confirm that.

My currency happens to be British Pounds (£), but I have bought stuff from American sites. The exchange is dealt with by the bank so you don't have to worry about it.