Would be curious to hear if they're using some sort of authentication for the client (ie. private key) as a way to bottleneck that. Would suck to have to relay everything through a smartphone for now... but there's always a better way.
I believe it's either phone OR drag/drop into a browser from a desktop, so just no client side Amazon app at the moment, maybe to keep everyone from installing it and setting it to backup everything on the initial launch.
EDIT: Nevermind, I'm now reading your comment less as "only smartphone available" and more as "use the smart phone app as a proxy"
