Can't open PDF Portfolio on iPad after latest updates of Acrobat Pro DC

I have previously been able to email a PDF Portfolio to my iPad from my iMac and open it just fine.  Evidently in some recent updates that can no longer be done.  When I try to open the portfolio on the iPad a blank screen comes up.  I can still open the portfolio when I send it to my iPhone like I have been able to do in the past on my iPad but not now.  I can send the individual files to my iPad and save and open them there individually.