Can't sign some pdfs
Using "Adobe Acrobat" online (https://documentcloud.adobe.com/) Fill & Sign I can sign pdfs, but after saving at the end, the signature disappears from some (not all) pdfs. For the ones that fail, it's not because those pdfs are already signed/secured/locked. I know this because I can successfully sign and save the exact same pdf using "Adobe Sign" online (https://eu1.documents.adobe.com/). I'm using the same browser and same procedure with Acrobat online and Adobe Sign online. Why can I sign some pdfs with Adobe Sign online, but not Adobe Acrobat online?
