Thanks! That was the ticket.
Here is what I ended up using:
((( resources['metadata']['name'] + '.ipynb'))): \attachfile{((( resources['metadata']['name'] + '.ipynb')))} \\
The path seemed to be an empty string for me, but the name was ok.
--
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu