Can I edit the underlying PDF after pulling it into ADOBE Sign?

I need to edit a few things on the underlying PDF after I have pulled it into Adobe Sign.

Can I do that? If that is not easily done, is there a way to copy and paste all the fields from Adobe Sign into a new COPY of the Adobe Sign document?  In other words, can I re-create the Adobe Sign document (make a copy) and then paste all the Adobe Sign-modified fields into the new COPY in order to save time by not having to recreate all the work done in preparing all the fields once the PDF has been pulled into Adobe sign?