How do I add a converted e-mail to a client's PDF file without having to make up a whole new file? Am using Acrobat DC.

[Rob Hallberg]

I just got Adobe Acrobat DC to convert my client's files to PDF for storage in my Documents File. I converted a new e-mail to PDF, but can't figure out how to add it to their exiting file without starting a whole new file. Is there a way to do this?