I am a blind user of Adobe Acrobat PDF files and sometimes the accessibility ge4atures do not work. Is this because there were not created accessible? Is there any way to tell right off the bat so I can iform the sender and they can correct the problem? I am so frustrated with Adobe!!!!!! I find it not very accessible and I am not sure if it is on my end or the creator's end.
Creating an accessible PDF is sometimes simple (choose the right options) and sometimes really hard (hours or days of work). Sometimes it is really not practical (such as a scan of a handwritten manuscript).
One thing to check is under document properties: tagged PDF. Generally a tagged PDF has some attempt at accessibility.