I have dropbox, idisc and an app called Always On PC, which works but is also clumsy at best. I just came from the Apple store (for a different issue) and was talking about the problem with a technician- not specific to these sites, but in general. His suggestion was that the developer of the site ...listening, Dave?...have someone write an app for the iPad/iPhone. That would take care of it. Even though the site is free, there could be a fee for downloading the app. Or not, depending on general finances, I guess.
Still hoping...
Pam