DropBox Help

I am the consumer who probably should not have purchased a ReadyNAS. I was out to purchase a consumer cloud and the guy at Staples insisted I would be much happier with a ReadyNAS. First he sold me a setup he insisted had a 8tb drive pre installed, my DA should have know by the great price this did not have a drive in it, and Diskless should have been my first tip that this guy didn't know what he was talking about. After setting it up and realizing it didn't have a disk I went on Netgear's site to find a compatible drive, and purchased a 3tb drive that was on the list. I have read 48 pages of the manual so far, and as far as an internal home server I have everybody setup in the house in order to be able to save files to it. I have setup my laptop and my cell phone to be able to access it out of the house. Very upset my Galaxy Tab 3 cannot access it via an app, its part of the reason I bought this was to have that additional storage for my Tablet.

Here is my first challenge, I only have a 50gb Dropbox account, its not what I wanted as my primary storage, I just want to store a couple of files on Dropbox I need access to, and to have the pics I take on my cell phone to upload to Dropbox. However since my wife has transferred her entire digital picture library, several 100gbs of family pics, I have been watching on my laptop as file after file of pictures are uploading to Dropbox from the ReadyNAS and this is not what I want. What I thought I was getting was the ability to upload to Dropbox, and then those files would transfer to the ReadyNAS, but it seems to be going the opposite direction. How do I stop the ReadyNAS from uploading files to Dropbox, and can I set it up for files that upload to Dropbox automatically download to the ReadyNAS?

I know, this DA should not even own this product at this point, but I have already invested $300 in this and at this point I need to get through the learning curve to make it work for me.