How do I attach external email correspondence with a seller to an open dispute?

[Dan_cobb92626]

I have been trying to resolve a return with a seller, only to get a bit of a run-around. Per their terms, I contacted them about a return, and they refuse to provide a return shipping address.

I have opened a dispute and escalated it to PayPal for review, but i cannot figure out how to attach this external correspondence to the case.

Is this possible?

Thanks