title: How to save image to Camera Roll using Expo?
body: <p>I'm creating an app using <code>Expo</code> to take picture, I'm already possible to save pictures to <code>FileSystem.documentDirectory</code>, but this is not what I want.</p>
  
  <p>I tried to save image to <code>Camera Roll</code> using code like this:</p>
  
  <pre><code>import { CameraRoll } from 'react-native';
  ...
  ...
  await CameraRoll.saveToCameraRoll(photo.uri);
  </code></pre>
  
  <p>But it's returning a warning me to use <code>react-native-cameraroll</code> instead of <code>react-native</code>. But as I see in the document of the <code>react-native-cameraroll</code>, it's seems not supporting <code>Expo</code>.</p>
  
  <p>Is there any way to save image to Camera Roll in <code>Expo</code>?</p>