The pdf format is not recognized

When I receive an email with a PDF attached, the icon takes the form of a question mark and I get the message "this format is not obedienceed'.» I have the Adobe app in my iPad.

Not really a Mac problem I see but a problem of the iPad.

OK, please explain step by step, how you use the Adobe app on your iPad. How do you get to the iPad? Is what app open it? What EXACTLY you click and select, in turn?

Tags: Acrobat

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