'react-native-fs' and 'react-native-fetch-blob' can not find the downloaded file

I user 'react-native-fs' and 'react-native-fetch-blob' to test file download in android emulator, the console show me that the download is success, but I can not find where the file is in my emulator file system,or maybe it did not download successfully,can anybody tell me what to do,thanks

Use this function for Android with react-native-fetch-blob.

It works for me and the downloaded file will be placed in the downloads directory of the device/emulator.

function downloadFile(url,fileName) {
  const { config, fs } = RNFetchBlob;
  const downloads = fs.dirs.DownloadDir;
  return config({
    // add this option that makes response data to be stored as a file,
    // this is much more performant.
    fileCache : true,
    addAndroidDownloads : {
      useDownloadManager : true,
      notification : false,
      path:  downloads + '/' + fileName + '.pdf',
    }
  })
  .fetch('GET', url);
}