title: Can't disable auto-download in version 4.3
body: <p>My config is:</p>
  
  <pre><code>self.editor = new $window.PhotoEditorSDK.UI.ReactUI({
      container,
      responsive: true,
      license: JSON.stringify(sdkLicenseData),
      assets: {
          baseUrl: '/dist/photoeditorsdk/assets/',
      },
      editor: {
          image: img,
      },
      style: {
          width: 800,
          height: 800,
      },
      enableExport: true,
      export: {
          type: $window.PhotoEditorSDK.ImageFormat.IMAGE,
          quality: 1.0,
          download: false,
      },
  });
  </code></pre>
  
  <p>I'm able to detect export being clicked by:</p>
  
  <pre><code>self.editor.on('export', (newUrl) =&gt; {
  </code></pre>
  
  <p>.. but it still downloads the image. How can this be disabled?</p>
  
  <p>I've also tried:</p>
  
  <pre><code>self.editor.on('export', (newUrl) =&gt; {
                              self.editor.export(false)
                                  .then((data) =&gt; {
                                      const foo = 1;
                                  });
  </code></pre>
  
  <p>...but again, by the time I execute the 2nd line, an image has already been downloaded.</p>