[Answer]-Django Admin doesn't recognize files uploaded on Google App Engine

djangoappengine contains a storage provider for the blobstore.

To me it doesn’t seem like a full-featured solution, just something to get file uploads running.

I had to add this to get some functionality I needed (urls to the files).
It might make the admin work too:

https://github.com/dragonx/djangoappengine/commit/6a472a80c25bc077816c9104b45d5a64f3063273