When browsing away from a portfolio export session (e.g. using breadcrumbs) then returning to the page with a "add to portfolio" button, a notice is displayed which says:
"You already have an active portfolio export in this session. Please complete that first, or click here to cancel it."
The string "cancel it" is a link which deletes the session data, but "complete that first" is not a link. It should be a link to the portfolio export page.