I'm having the same problem, too. After finishing the IP turorial, I got to be able to upload my meshes in the Aditi grid for testing. After some testing, I tried to do that also in Agni grid, however, there is no 'Models' item in the uploading menu. Then, I took a look at my Mesh Status on the official web site of Linden, and found my tutorial still hasn't finished.
I really hope to be able to upload my own meshes soon.