I am using Acrobat Pro XI on a MacOSHigh Sierra. I make up songbooks, that are constantly changing as songs are added or deleted due to performance requirements.
For a year or so I have been adding MS Word files to an existing PDF just by dragging them in to the side bar.
Suddenly I continually get the damaged document error, even for files I have used before with no issues. So I have to convert every Word file to PDF before importing. I assume it is since an update, but it is causing me major grief and wasted time.
I'd really welcome any help on this - I have already searched all the FAQ and Googled extensively, but most answers are irrelevant!