Hey, I’ve tested it and it seems the copy button does fail (I’m going to fix it now), but doing it manually does seem to work.
In the browser: go to Export, click the code, Ctrl + A, Ctrl + C → In the executable: go to Import, Ctrl + V, and click the Load button. (this should 100% work)
I’ve tried several times and it gave me an error too, especially when not using Ctrl + A, it seems the code doesn’t copy correctly. Sorry, I’m going to fix it.