I have found that if I scan my documents thru my scanner app and save them to a file - I named mine quickbooks scanned documents - I can then attach them to my invoices.  You just have to select the option "from computer". My system is set to look at the quickbooks scanned documents for the file I need.  I name the file by company and PO number to keep it organized, with the newest scanned documents on top.  Hope this helps you - it doesn't look like QB management listen to their users.