I've bumped the version of dropzone up to 3.8.2 due to an error I was getting when attempting to drag and drop a file into a designated dropzone area.  The error was cannot read property 'isFile' of null.  Did a quick google search and it there was an issue (https://github.com/enyo/dropzone/issues/285) which led me to believe the version of dropzone was the cause.  It seems to have fixed the problem.