My Scenario: 

A supplier has shared a portfolio with me requires me to upload a copy of my ID document to the portfolio, but I do not know how to go about doing this. 

Your Solution: 

First of all, to locate and open the portfolio in question, please see the "How do I access a portfolio that was shared with me?" article in the FAQ section.

Now that you have the portfolio open (see image below), you simply click on the button.

You will be directed to a page as per the image below, and will need to click the Browse button and locate the document you would like to upload - in this instance, a copy of your ID document saved to your hard drive -  and then click

This will upload the document to the portfolio and immediately notify the originator that a document has been added.