Description to 'system file path to the directory' should not be upper case S3.

Filebrowser.module points directly to a lowercase 's3://' directory prefix, although the node edit UI description uses uppercase 'S3://bucket_name' as an example. Recommend using strtolower as possible solution.

In filebrowser.module:

/**
 * Check if a given path is an amazon directory
 * @param $dir Directory to check.
 * @return bool TRUE if it is an amazon directory, FALSE if not.
 */
function is_s3_dir(&$dir) {
  $dir_prefix = substr($dir, 0, 5);
  if ($dir_prefix == 's3://') {
      var_dump($dir_prefix);
    return true;
  }
  else {
    return false;
  }
}