It would be great if dropbox could actually mark up/ annotate images & PDFs. When I say annotations & mark ups I am referring to drawing shapes (lines, circles, etc), arrows, text, highighter, etc on the image/ PDF. I know we can do with Preview & such but it is cumbersome using a 3rd party app. Evernote, for example, can annotate something within seconds & you keep moving along with your day.
This would allow taking notes in school with dropbox to be feasable