The control, however, had some performance issues and it was highly requested by a vast number of customers that we remove it. In 8.5 we removed the control and we finally were able to build a UI that worked and behaved the same in all browsers that we supported. Our expectation was that most customers would simply use the connectors (which I heard is how 95% of people use Quickr) to achieve this same functionality.
Some customers, however, are wondering how can they get this functionality back. One of our developers from our Dublin lab has documented how to do this in the Quickr Wiki so that you can re-add this capability to Quickr 8.5 as shown below:
Once you follow the instructions, you will have a Java applet which will let you drag-n-drop files into Quickr. As an added bonus, because it's Java, it should work cross-platform. If you need this capability, simply follow the step-by-step instructions here.
Enjoy!