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<script>
  window.UploadKit = window.UploadKit || {}
  window.UploadKit.callbacks = {
    afterRefresh: function(data) {
      // data is an object like:
      // {
      //   el: <html element of the upload field container div>,
      //   uploader: <json object representing the upload field>,
      //   files: <json array representing the uploaded files>
      // }
    }
  }
</script>