Well - Okay, here are the steps...
Someone visits the page - they see the job/product they want. They click buy now. Using Powerstore - they have to create an account to purchase, correct? Even through Paypal? So lets say they purchase product #1 and they do it through paypal.. They create their account, make the purchase... the email gets sent to the outsourcer.
The outsource logs in, and goes to page where I have a file upload and email. Can UE 4.0 allow the outsource to upload the file to my server in a custom folder (just for that customer) and have it email the customer the link to their product/job? Would it be possible to make them login before downloading the file?
This seems more complicated than you make it sound?