title: use `getValueFromEvent` in ant design Form
body: <p>i wanted to know how to use ant image picker (or any other component) in ant design form.
  and if possible i wanted to know how getValueFromEvent will be called and how to change it to make in work.</p>
  <p>here is my sample. i think its pretty straight:</p>
  <p><a href="https://codesandbox.io/s/antd-reproduction-template-forked-lfk7k?file=/index.js" rel="nofollow noreferrer">https://codesandbox.io/s/antd-reproduction-template-forked-lfk7k?file=/index.js</a></p>
  <p>this section should be trigged in some way.</p>
  <pre><code>const normFile = (e) =&gt; {
    console.log(&quot;Upload event:&quot;, e);
    if (Array.isArray(e)) {
      return e;
    }
    return e &amp;&amp; e.fileList;
  };
  </code></pre>
  <p>the only thing i'm not understanding is how the event will be trigged?
  i'll be thankful for any document or link or ...</p>