I am building a set of expansion modules, and would like to distribute them and use them as a selectable expansion when submitting challenges. I have used the “installs” directory to reference the files, which are all in an expansion-like directory tree under the main GSB directory. The files show up fine in the game. However, when I try to submit a challenge, I do not get the option of listing my expansion as a required one. How do I do this?