Unable to digitally sign inside a portfolio using Adobe Acrobat on a Mac. Windows users in my organization do not have this issue. Mac users must extract and sign the page, then reinsert it into the document. Is this expected behavior? If so, why? I am running El Capitan and Acrobat 11.0.17. If I open the portfolio and try to sign the Fill & Sign section is an empty white space. If I open a single document and sign then open the portfolio to sign, the Fill & Sign space is OK but the space where the portfolio should show is empty white space. Help!?!