Possible to sync Endnote library attached PDFs with Dropbox between computers and devices?

I attach my PDFs linked to structured subfolders in a Dropbox. This works between computers sharing an Endnote library (X9) when I have the locations mapped the same way, but I’m wondering if it’s possible to do this with the iOS app if I switch over to using a cloud based library. I don’t want to have to store my PDF files in the Endnote cloud.