title: How to upload a file with puppeteer and dropzone?
body: <p>I use <a href="https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#event-dialog" rel="noreferrer">puppeteer</a> and I have a <a href="http://www.dropzonejs.com/#usage" rel="noreferrer">dropzone</a> form.</p>
  
  <p>I want to add a file from chrome headless to the dropzone form.</p>
  
  <p>How can I do that? </p>
  
  <p>Note:
  The form contains some actions in some dropzone events (when added file).</p>