How to tell if/when you downloaded files from Dropbox or Google drive?

I am worried that, in general, there is another computer where I have not logged out of my gmail or Dropbox. I make it a habit to log out of my email regularly, but I could always have forgotten somewhere. Thus, someone could easily download important files on my google drive and or Dropbox, if I didn't log out.

Is there a way to see on Google Drive or Dropbox if your files have been downloaded, and when? I know Google drive and Dropbox tell when files have been UPLOADED. How do you find if/when files have been downloaded?