Sync and unsynced indications
Every item in the view area has an icon next to it indicating whether it’s synced 
or unsynced 
When a file is in its unsynced state you can either wait for it to synchronize or you can click on the sync now button.
This will move the file up in the priority queue of unsynced items. When a file begins to sync it will be indicated with the following progress bar:
You may cancel the synchronization process of the file anytime by clicking on the cancel sync button 
(when the file is downloading) or 
(when the file is uploading).