New details:
If I check "stack with original", the original will be thrown to the end of the folder, together with the copy.
If I uncheck "stack with original", the original stays in place, but the copy will land at the end of the folder.
Suddenly, library has stopped working.
I suggest to get the library working properly before thinking of version 2.0.
As for now, the library is a mess, and cannot be used properly.