Every time I use the dropbox, I have to click to dropbox to check the syncing process. I know it's syncing, but I cannot know how much left without click the dropbox icon.
When I download an app on my iPhone, the app icon itself tells me the install process by showing a running circle. I think it’s a good example. Maybe you could make the dropbox icon to show a running circle too, or like a reservoir, when processing a syncing. Users could pause and start by clicking the icon, and see the details by long press the icon, or whatever you could design.
This is really what I need. I run MATLAB simulations, which sometimes generates large data files. I know dropbox does the syncing job every time a file is saved, deleted or generated. But the syncing percentage is hidden unless I open the dropbox window. It would be very convenient that we just know it by simply taking a look at the icon.