title: Save remote image to camera roll in React Native?
body: <p>I'm getting nothing but errors from the ReactNative CameraRoll's <code>saveImageWithTag</code> function. Saving a local image with something like:</p>
  
  <pre><code>CameraRoll.saveImageWithTag('./path/to/myimage.png');
        .then(res =&gt; console.log(res))
        .catch(err =&gt; console.log(err));
  </code></pre>
  
  <p>gives me the error: </p>
  
  <pre><code>Error: The file “myimage.png” couldn’t be opened because there is no such file.(…)
  </code></pre>
  
  <p><code>./path/to/myimage.png</code> in this case is the path I'd use to <code>require</code> an image for an <code>Image</code> source. What should the full path be for a local image be? Do I need to store them differently to make them accessible? </p>