Typically a PDF with email is the PDF file being an attached file to the email message.
Use your email's method to save a copy the attached file to your computer.
Launch Acrobat, open the PDF that you saved to the computer.
From within Acrobat (or Adobe Acrobat Reader) you can upload the PDF to the "Files" section of the Acrobat Document Cloud.
What did you do and what happened that you are having problems with it?