DropboxdownloadViewController :

-> Displaying the List of Pdf Files and Folders .
-> Showing the sub files and sub folders inside the folder .
-> Creating the folder.
-> Deleting the file and folder .
-> Rename the file and folder .

FolderChooseViewController :
-> displaying the colders to choose .

Detail View Controller :
-> Uploading Multiple Files .
-> Uploading a file to selecting folder .