Android - "This document cannot be modified because it is an attachment" I have a PDF portfolio with about 40 individual PDFs in it. This document has fill and sign fields on various PDFs. We are able to successfully Fill&Sign on a desktop, but not on mobile Android. When we open the document we are presented with the following error: "This document cannot be modified because it is an attachment" If you tap on the blue edit icon on the bottom right and select Fill & Sign, we receive the same message as above. I have downloaded the Fill and Sign application from the app store as well, but when I open the workbook with that app it tells me "For the best eperience, open this PDF portfolio in Acrobat X or Adobe Reader X, or later". So I'm not even able to access this portfolio on android with anything other than Adobe Acrobat. My ultimate goal: to enable fill and sign functions within this workbook on android using the free Adobe Acrobat app. I have already updated/installed the latest version of ALL apps. This issue is replicated on