From Dropbox –

“These new apps offer all the Dropbox features you know and love. You can:

-Automatically back up your photos to Dropbox
-Mark files as favorites so you can get to them even when you don’t have an Internet connection
-Access both your personal and work accounts at once
-We’ve also tailored the app for the Windows platform, so you can pin any Dropbox folder to your Start screen for quick and easy access.

The app is available for download on Windows phones (8.0 or higher) and Windows devices running on Windows RT or Windows 8.1. Take it for a spin today!”

Source – https://blog.dropbox.com/2015/01/windows-phones-tablets/