FileBrowser really does act as the bridge between all your file storage. Copy files between your PC / Mac to Dropbox, from Google Drive to Box or from anywhere to anywhere...
It's the easiest File Manager app on the appstore.
Many apps are able to connect to different storage types, but FileBrowser also allows you to have multiple connections to a single type, such as 3 Google Drive accounts, for example.
FileBrowser can attach multiple files from different storage locations to a single email, a feature lacking in other file explorer apps.
FileBrowser features file name subfolder searching for all storage locations, and also supports document content searching for Google Drive.
FileBrowser's multi-file copy allows you to easily copy several documents and folders in one go from any location to any other location.