Navigate to your Sent packages tab (under Packages tab in the left hand side menu). Here, you will be able to view all the deliveries received via al of your Portals.
On the right hand side of each delivery, you will see a download button. Pressing the button will take you to the download page.
Alternatively, you can click the options button (three dots) to view more details and access the download page.
In addition to that, you can also set up Recipient email addresses (up to 5 addresses) where you will receive email notification as soon as someone uploads to your Portal.