SO WE ALL KNOW NOW: we no longer have drag and drop to insert files and images. Instead of a simple 2 second operation, now you have to open the attach box, find the appropriate menu for where the file is in your computer, then spend two minutes searching through all the files to find the right filespec that matches the one you are looking for! NICE!
A REAL IMPROVEMENT (sarcasm intended)
You can still use the html brackets. I don't use the drag and drop because typing is faster in some cases.