title: react-native filesystem can't find app files
body: <p>I'm building an app with react-native, and I'm trying to use the react-native-fs module to list out a series of images located in the app folder.  The images are located in a folder in the app project folder named 'data', so for example if I want to display one of the images, this works:</p>
  
  <pre><code>&lt;Image source={require('./data/boo.png')} /&gt;
  </code></pre>
  
  <p>However when I try to use react-native-fs to list out all the files in that folder like so:</p>
  
  <pre><code>  RNFS.readdir(RNFS.DocumentDirectoryPath+'/data') 
    .then((result) =&gt; {
      console.log('GOT RESULT', result);
    })
    .catch((err) =&gt; {
      console.log(err.message, err.code);
    });
  </code></pre>
  
  <p>I get the error 'Folder does not exist'.  Also when I remove the +'/data' the only result listed is a file by the name of 'ReactNativeDevBundle.js', with a path of '/data/user/0/com.awesomeproject/files/ReactNativeDevBundle.js'.  Is this the expected behavior?  If this is the expected behavior, and I am doing something wrong, how can I access the file folder I want from within the app?  Side question, if I wanted to provide that Image tag with an absolute path, what would that look like.</p>