On many occassions, the networks I work with will just send me an email with something like 20 offers in various verticals.
So here's my idea:
Send the network a template csv file that has fields for things like "campaign id, payout, aff link, etc". They fill it out with the offers for you to run, and you directly import it into Prosper. This way, you have 20 new offers ready to build links for in Prosper instead of manually going through the process of creating each of the offers, which can be tedious.
Basically, the upload would allow a CSV file that contains all of the required settings on "step3" in the Prosper setup.