I tried Mesh yesterday as well, Got the right viewer, logged into the right grid.
I could see the upload created in my inventory ( the duck) although it has a new name. The upload process took about a minute even though the screen said it was completed ( perhaps lag my end). Sadly when rezzed on the ground I could not see it at all ( although my friend could see the duck.) That I think is a result of the poor graphics card I have in this laptop.
So I'm happy it works, sad I just can not see them till I get back to my good PC.
When the item has finished uploading the viewer will point to its location in your inventory.
I hope that helps.