geez, there's a new iphone app called shozu. actually, its available for a lot of cell phone platforms.
look at the long list of sites it supports for upload but you guessed it, zenfolio is not one of them...
surprise surprise.

 http://www.shozu.com/portal/tour.do?operation=where

If you are looking for them to provide support for Zenfolio, they have a forum and a Contact form available here: http://www.shozu.com/resources/portal/support/en/support.html