Dropbox Camera Upload for Camera FV-5 raw (DNG) photos On Nexus 5 &amp; Android 5, Camera FV-5 can capture raw photos, stored in DNG format.

How can I upload the DNG files automatically to some kind of cloud storage?

For example, the "Camera Upload" feature in Dropbox seems to ignore DNG files.
You can try Dropsync PRO, that will do what you want.