App\Http\Controllers\Backend\UploadController::uploadFile PHP Method

    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]);
    }