Get to the bottom of things: you can now zoom into a subfolder by clicking it!
Waiting for a long upload? You won't get lost anymore: the new loading screen will update you on the progress.
Save your work, pick it up later: when you click the Export button, you get a save of your work. Next time around, upload that file, rather than you file tree; you'll pick up where you left off with next to no loading time!