title: Limit file upload on dropzone and force an error
body: <p>Using jquery dropzone plugin, I am trying to alert an error message when users attempt to upload more than one file and then stop/reset the dropzone.</p>
  
  <p>I found this helpful post which got me where I am:
  <a href="https://stackoverflow.com/questions/18048825/how-to-limit-the-number-of-dropzone-js-files-uploaded">How to limit the number of dropzone.js files uploaded?</a></p>
  
  <p>Fortunately, I was able to get an alert message to appear when <code>maxfilesexceeded</code> is reached, however I am unable to stop the upload of the single file. It seems dropzone will still attempt to upload one of the files if multiple files are sent.</p>
  
  <p>What would be the best way to force an error so none of the files are uploaded and the dropzone element can reset? Thanks!</p>