private static function addCuadro($gestor, $sesion)
 {
     $destino = "../contenido/" . $sesion->getUser()->getEmail() . "/";
     $subir = new UploadFileMultiple("foto", $destino);
     $subir->upload();
     if ($subir->getSubida(0)) {
         $bd2 = new DB();
         $gestorC = new ManagerCuadro($bd2);
         $cuadro = new Cuadro();
         $cuadro->read();
         $cuadro->setUrl($subir->getDestino(0));
         $gestorC->insert($cuadro);
         $bd2->close();
         self::crearCuadro($gestor, $sesion, "<h1>Cuadro creado.</h1>");
     } else {
         self::crearCuadro($gestor, $sesion, "<h1>Fallo la subida del cuadro. Destino: {$destino}</h1>");
     }
 }