Adobe Portfolio documents are a group of PDF's Clipped together in a PDF. I believe that this format has been a standard since Adobe 9 around 2008. A portfolio document looks like a stardard PDF and clients do not understand why DocuWare is not Compliant with the Portfolio Standard for PDF. I would suggest that because this is VERY simular to DocuWares Clipping that DocuWare EXPORT all of the files in a portfolio document and clip them together as one Document making it easier for the client to work with
OR
Introduce a different viewer allowing the user to parse thru the Portfolio as if it were a set of clipped documents. The issue here is that not all Documents in a Portfolio are PDF, they are allowed to be anything.