title: Facebook images not working in dialogflow chatbot integration
body: <p>i'm trying to make work the Dialogflow (online platform) chatbot in Facebook but seems it doesn't recognizing the images. Here is my code:</p>
  <pre><code>{
  &quot;facebook&quot;: {
  &quot;attachment&quot;: {
    &quot;type&quot;: &quot;template&quot;,
    &quot;payload&quot;: {
      &quot;template_type&quot;: &quot;generic&quot;,
      &quot;elements&quot;: [
        {
          &quot;title&quot;: &quot;Welcome to Peter's Hats&quot;,
          &quot;image_url&quot;: &quot;https://alfi.de/media/logo/stores/1/alfi-Logo-small.jpg&quot;,
          &quot;subtitle&quot;: &quot;We've got the right hat for everyone.&quot;,
          &quot;buttons&quot;: [
            {
              &quot;type&quot;: &quot;web_url&quot;,
              &quot;url&quot;: &quot;https://google.com&quot;,
              &quot;title&quot;: &quot;View Website&quot;
            },
            {
              &quot;type&quot;: &quot;postback&quot;,
              &quot;title&quot;: &quot;Start Chatting&quot;
            }
          ]
        }
      ]
    }
  }
    }
  }
  </code></pre>
  <p>the fact is that works with this code:</p>
  <pre><code>{
   &quot;facebook&quot;: {
  &quot;attachment&quot;: {
    &quot;type&quot;: &quot;image&quot;,
    &quot;payload&quot;: {
      &quot;url&quot;: &quot;https://alfi.de/media/logo/stores/1/alfi-Logo-small.jpg&quot;
    }
  }
    }
  }
  </code></pre>
  <p>then, I tryed several combinations, but seems the image works better alone. I also tryed different templates, but seems not to work. Any suggestions?</p>