Victoria - To let people access your Google drive, you have to create a folder and share it.?
Once you set up a link address from the sharing dialogue you can put that in your GIO group as we've discussed previously. From that point forward anything you drag into the folder should be visible to group members via clicking on the link.
I know of no way to make the folder public so others can upload to it. Perhaps someone with more experience can help you with that part.
Hope this helps,
Bruce
Bruce Bowman