TumbleLog Cant Make Images, Video and etc work

I downloaded from github, and I tried tumblelog.
I installed all requirements and its running.
However, it is NOT storing anything other than BlogPost. (Checked MongoDB, All data are BlogPosts)

When I use Images/Video.
After saving, I'm redirected to make a BlogPost.

I'm not sure what to edit in the admin.py.

I need help.