File management for iOS What are some better solutions (apps or any ways) to manage files (folders and subfolders with PDFs, docs, video, audio etc.) on iOS device (iPhone or iPad) that can sync with OS X? 

Currently I'm using "USB Disk Pro" but I have to manually create the folders in iTunes and drag and drop each files manually. (Image if there are 10 folders with 50 files in each folders to be transfer from OS X to iPad.)
I think Dropbox would be a good solution. 


The Dropbox app will automatically create a folder on your OS X. Put files that you want to access on your iOS devices into the folder.
Install the iOS app on your iOS devices. You will be able to access all the files that's stored in the OS X folder easily.


Note that there's a space limit for the Dropbox service.