Compiling PDFs with internal links to PDFs in Research

I apologize in advance if this has been covered ( I’ve looked, and looked), but I am pulling my hair out, and am quickly running out of time putting together some legal documentation.

I have emails in pdf form in my research folder that I would like to include links to in the main pdf when compiled to create one pdf with internal links to internal pdf docs (of emails). Rather than busy the document with inline images of related reference material, I would like the ability to just have appropriate links (but not need to include multiple pdfs).

I have wasted SO much time futzing with this, my research has suffered horribly.

CAN THIS BE DONE???

Am I missing something blatant?

ANY help anyone could provide would be appreciated more than I could say.

THANKS!!!
Lance