I didn't need to set up a new Dropbox account. I already had one, used it with my computer and Nook. I even closed the pop up that told me about the 50gb free when I first opened the app on my s5. Later, I decided I wanted the storage and signed into my account on my s5 and the 50gb was automatically there, along with all the stuff that I already had stored there. I actually have 51.75 gb because I think they added the 50 to the free account I already had. My sd card is not big enough so for now I plan on mostly using the space to move photos and videos to when I'm away from my computer to free up space on the card (until I get a bigger card).