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Error when open PDF-file in email

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I read my emails with Firefox for android in my mobile phone. When I try to open a PDF-file in an email the information is unreadable. There is an error message which says thai it is unredable due to unvalid format. What can I do to read the PDF-file in the attachment?

I read my emails with Firefox for android in my mobile phone. When I try to open a PDF-file in an email the information is unreadable. There is an error message which says thai it is unredable due to unvalid format. What can I do to read the PDF-file in the attachment?