private static function normalizeNestedFileSpec(array $files = [])
{
$normalizedFiles = [];
foreach (array_keys($files['tmp_name']) as $key) {
$spec = ['tmp_name' => $files['tmp_name'][$key], 'size' => $files['size'][$key], 'error' => $files['error'][$key], 'name' => $files['name'][$key], 'type' => $files['type'][$key]];
$normalizedFiles[$key] = self::createUploadedFileFromSpec($spec);
}
return $normalizedFiles;
}