I'm new to BitBucket and SourceTree. I created a repositority. I checked my project into it. I invited a new user, who was not formerly a user of BitBucket and SourceTree. I watched him create an account for both, in response to the invitation. I can confirm from my Users & Groups page that he has write access to the repository. But then he logs in to SourceTree using his credentials and can't see anything. Under Remote it shows nothing. What does he need to do to make his SourceTree aware of the repository I shared with him, so he can check it out?