Attached to the email

Hi, I can’t open a PDF attachment directly from the email because I’m being offered applications that can’t open a PDF.
Acrobat is installed and still with the previous mail app they opened normally with Acrobat. I don’t think it’s a mobile phone problem because in any other App with attached PDFs they are opened normally. Have you encountered a similar problem?

My guess would be that the email client of the sender of that email does not correctly indicate the file type of the attachment.