title: Add existing image files in Dropzone
body: <p>I am using <code>Dropzonejs</code> to add image upload functionality in a Form, as I have various other fields in form so I have set <code>autoProcessQueue</code> to <code>false</code> and Processing it on click on Submit button of Form as shown below.</p>
  
  <pre><code>Dropzone.options.portfolioForm = { 
  
      url: "/user/portfolio/save",
      previewsContainer: ".dropzone-previews",
      uploadMultiple: true,
      parallelUploads: 8,
      autoProcessQueue: false,
      autoDiscover: false,
      addRemoveLinks: true,
      maxFiles: 8,
  
      init: function() {
  
           var myDropzone = this;
           this.element.querySelector("button[type=submit]").addEventListener("click", function(e) {
  
               e.preventDefault();
               e.stopPropagation();
               myDropzone.processQueue();
           });
       }
   }
  </code></pre>
  
  <p>This works fine and allows me to process all images sent when form is submitted. However, I also want to be able to see images already uploaded by user when he edits the form again. So I went through following post from Dropzone Wiki. 
  <a href="https://github.com/enyo/dropzone/wiki/FAQ#how-to-show-files-already-stored-on-server" rel="noreferrer">https://github.com/enyo/dropzone/wiki/FAQ#how-to-show-files-already-stored-on-server</a></p>
  
  <p>Which populates <code>dropzone-preview</code> area with existing images but it does not send existing images with form submit this time. I guess this is because theses images are not added in <code>queue</code> but If it's so then how can update on server side, In case an existing image is removed by user?</p>
  
  <p>Also, what would be the better approach, add already added images in <code>queue</code> again or just send information of removed file?</p>