protected function prepareArrayBasedFileInput(&$uploads, $key, $file)
{
preg_match_all('/([^\\[\\]]+)/', $key, $segments);
$segments = array_reverse($segments[1]);
$newKey = array_pop($segments);
foreach ($segments as $segment) {
$file = [$segment => $file];
}
$uploads[$newKey] = $file;
unset($uploads[$key]);
}