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Controller code:

public function doUpload(Request $request)
    {
        //判斷是否是一個有效上傳文件
         if ($request->input('picname') && $request->input('picname')->isValid()) {
            //獲取上傳文件信息
            $file = $request->input('picname');
            /*print_r($file);*/
            $ext = $file->extension(); //獲取文件的擴展名
            //隨機一個新的文件名
            $filename = time().rand(1000,9999).".".$ext;
            //移動上傳文件
            $file->move("./upload/",$filename);
                                
            return response($filename); //輸出
            exit();
        }else{
            //閃存信息
            return redirect('demo/upload')->with('status', '請選擇上傳文件!');
        }
    }

error:Call to a member function isValid() on string
in FilmController.php (line 59)
at FilmController->doUpload(object(Request))
at call_user_func_array(array(object(FilmController), 'doUpload'), array(object(Request)))
in Controller.php (line 55)