Think there should be a google drive app aswell, however I can't find where that is, any ideas? It is listed on the guide on the DNS-320L dlink web page. Must admit, D-Link don't make it easy to find what is available and if you need to download it and where that download is or not for your specific sharecenter.
http://www.dlink.com/-/media/Files/Downloads/Quick_Guide_ShareCenter_DEU.pdf