Why are you using the test server Candance. At a guess, it is not possible to use the test server with the gallery. I really do not know. I do know the test server lacks lots of capabilities. 
The test server should be used to 'test' new components etc.
Did you follow Tim's advice and an try using the regular server? Ala Tim: use the gallery, set up a private studio under your account, then share the ID with your students. They can then upload their AIA projects to your private studio. You must ensure that they tick the ckeckbox : Check if you want your app to be findable with a search ?
This link indicates MIT is aware of issues Assigning projects to a Gallery Studio?. Hopefully someone at MIT will comment soon.