Bp Group Documents and Activity Plus

Hi there.
I've installed both BP activity Plus and BP Group Documents. The problem I have is that when I try to upload a document from my activity stream, the page requests that I select a group to upload the doc to. No "Post In" box appears, however, and thus I can't select a group to upload to.

I thought I saw a post onthis a while back, but all my searching has been in vain. Any help is appreciated!