multiple file upload symfony 4

I am trying to upload more than an image in the database. but my code uploads only the last one selected. here is the code:

/**
     * @Route("/property/add-media/{id}", name="addPhotoProperty")
     * @Method({"GET", "POST"})
     */
    public function addPhotoToProperty(Request $request, $id){
        $property = $this->getDoctrine()->getRepository(Property::class)->find($id);
        $media = new Media();

        $mediaForm = $this->createFormBuilder($media)
            ->add('pathtofile', FileType::class, array(
                'mapped' => false,
                'multiple' => true,
            ))
            ->add('isvideo', ChoiceType::class, [
                'choices' => [
                    'Video' => '1',
                    'Photo' => '0'
                ],
                'multiple' => false,
                'expanded' => true
            ])
            ->add('upload', SubmitType::class)
            ->getForm();

        $media->setProperty($property);
        $mediaForm->handleRequest($request);

        if ($mediaForm->isSubmitted() && $mediaForm->isValid()){
            $files = $mediaForm->get('pathtofile')->getData();
            //dd($files);

            foreach ($files as $file)
                {
                    $filename = md5(uniqid()).'.'.$file->guessExtension();
                    $file->move($this->getParameter('uploads'), $filename);
                    $media->setPathToFile($filename);
                    //dd($media);
                    $em = $this->getDoctrine()->getManager();
                    $em->persist($media);
                    $em->flush();
                }
        }

        return $this->render('Property/addPhotoProperty.html.twig', [
            'media' => $mediaForm->createView()
        ]);
    }

as you can see I am calling the object from class entity. the form of the file uploader accepts multiple files or images in this case.

Your problem is in your loop. You are using the same Media entity and only change the PathToFile property. On first $em->flush(); you are creating a new entry, but since this is the same entity (AKA not a new one), Doctrine is doing an update.

foreach ($files as $file)
{
    $filename = md5(uniqid()).'.'.$file->guessExtension();
    $file->move($this->getParameter('uploads'), $filename);
    $media->setPathToFile($filename); // Same entity, that is being updated

    $em = $this->getDoctrine()->getManager();
    $em->persist($media);
    $em->flush();
}

I suggest you to create a new one in your loop. In example :

$em = $this->getDoctrine()->getManager(); // You don't need to slow down your code and request the same entity manager on each iteration
foreach ($files as $file)
{
    $filename = md5(uniqid()).'.'.$file->guessExtension();
    $file->move($this->getParameter('uploads'), $filename);

    $NewMedia = new Media();             // new entity, that is being created
    $NewMedia->setProperty($property);
    $NewMedia->setPathToFile($filename);

    $em->persist($NewMedia);
}
$em->flush(); //Flush outside of the loop, Doctrine will perform all queries