title: react-native-fs writeFile only works for the first file
body: <p>I am using react-native-fs to write json files to my external storage. It works perfectly for the first written file and the output is what I want but the subsequent writeFile calls do not produce files. I made sure that android has the proper storage permissions.</p>
  <p>I am using:</p>
  <ul>
  <li>react-native 0.60.5</li>
  <li>react-native-fs 2.18</li>
  <li>Android 11</li>
  </ul>
  <p>This is my code:</p>
  <pre><code> RNFS.writeFile(RNFS.ExternalDirectoryPath + &quot;/ws_response/&quot; + &quot;Resp_For_&quot; + this.state.serviceAction.split(&quot; &quot;).join(&quot;&quot;) + &quot;_id_&quot; + response.data.alkTripId + &quot;.json&quot;, JSON.stringify(response.data), 'utf8')
                      .catch(error =&gt; {
                          Util.alert(error.message);
                      });
  </code></pre>