You only don't have the ability to modify the scans at the external level. You most certainly have access to the scans to do the designs. You are having some communication errors with iTero. I suggest you ask again. You do have access to the scans at all 3 levels of participation. That's what its for. If you don't have access, then the Doctor didn't pay the fee on your behalf; he paid it for himself and is having the models sent to you. If it was paid for you, then as a external lab partner, Aligntech will install their viewer software and portal on your computer. If you don't have it, your not a partner. I should also ask...did you go through training with iTero? That's included with every level of partnership.