title: Add blob to dropzone.js queue instead of file
body: <p>I use dropzone.js to upload files. However my files are getting preprocessed before uploading. In the end I have a <code>blob</code> which I would like to upload.
  Unfortunately there is only a <code>addFile()</code> method available but no <code>addBlob()</code> method. I know I could use the <code>File</code> constructor like this:</p>
  
  <pre><code>new File([blob], 'filename', options)
  </code></pre>
  
  <p>but the constructor is not available in IE/Edge.</p>
  
  <p>Is there any way to attach a blob to the dropzone.js queue? </p>