The Dropbox app is INCREDIBLY basic. You can only open your files, no uploading, no moving files around, you can't even download the files. It feels very rushed and needs A LOT of improvement.
Doesn't matter to me though, I switched to Skydrive a long time ago for all my cloud storage needs. Works amazing with my Windows 8 desktop, Windows 8 laptop, Surface RT, and Lumia 900. Sorry Dropbox, but with your failure to properly support these platforms and only offering a pitiful 2GB compared to the 25GB I got with Skydrive, you've lost my business. Even with all the upgrades and promotions, I only have 8GB on Dropbox but 28GB on Skydrive. There is only one Dropbox feature that I miss, and that's being able to sync Shared folders in the desktop client. With Skydrive, you're limited to the website for shared folders.