/**
  * Upload new file
  */
 public function uploadFile(UploadFileRequest $request)
 {
     $file = $_FILES['file'];
     $fileName = $request->get('file_name');
     $fileName = $fileName ?: $file['name'];
     $path = str_finish($request->get('folder'), '/') . $fileName;
     $content = File::get($file['tmp_name']);
     $result = $this->manager->saveFile($path, $content);
     if ($result === true) {
         return redirect()->back()->withSuccess("File '{$fileName}' uploaded.");
     }
     $error = $result ?: "An error occurred uploading file.";
     return redirect()->back()->withErrors([$error]);
 }