Symfony 4.2 VichUploaderBundle: File not saved - symfony

Question

I'm using VichUploaderBundle in my application to upload the files.
Problem is that even if I followed the docs, the file isn't uploaded (even if seems to be all right, as profiles sais), and no rows was make in the entity table.
Here is my vich_uploader.yaml:
vich_uploader:
db_driver: orm
mappings:
media:
uri_prefix: /media
upload_destination: '%kernel.project_dir%/public/media'
inject_on_load: false
delete_on_update: true
delete_on_remove: true
Here is my Media Entity:
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\HttpFoundation\File\File;
use Vich\UploaderBundle\Mapping\Annotation as Vich;
/**
* #ORM\Entity
* #Vich\Uploadable
*/
class Media
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* NOTE: This is not a mapped field of entity metadata, just a simple property.
*
* #Vich\UploadableField(mapping="media", fileNameProperty="imageName", size="imageSize")
*
* #var File
*/
private $imageFile;
/**
* #ORM\Column(type="string", length=255)
*
* #var string
*/
private $imageName;
/**
* #ORM\Column(type="integer")
*
* #var integer
*/
private $imageSize;
/**
* #ORM\Column(type="datetime")
*
* #var \DateTime
*/
private $updatedAt;
/**
* If manually uploading a file (i.e. not using Symfony Form) ensure an instance
* of 'UploadedFile' is injected into this setter to trigger the update. If this
* bundle's configuration parameter 'inject_on_load' is set to 'true' this setter
* must be able to accept an instance of 'File' as the bundle will inject one here
* during Doctrine hydration.
*
* #param File|\Symfony\Component\HttpFoundation\File\UploadedFile $imageFile
*/
public function setImageFile(?File $imageFile = null): void
{
$this->imageFile = $imageFile;
if (null !== $imageFile) {
// It is required that at least one field changes if you are using doctrine
// otherwise the event listeners won't be called and the file is lost
$this->updatedAt = new \DateTimeImmutable();
}
}
public function getImageFile(): ?File
{
return $this->imageFile;
}
public function setImageName(?string $imageName): void
{
$this->imageName = $imageName;
}
public function getImageName(): ?string
{
return $this->imageName;
}
public function setImageSize(?int $imageSize): void
{
$this->imageSize = $imageSize;
}
public function getImageSize(): ?int
{
return $this->imageSize;
}
}
I just need to store the file in the entity, there is no relations between files and other entities.
Here is my MediaType
<?php
namespace App\Form;
use App\Entity\Media;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\FileType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Vich\UploaderBundle\Form\Type\VichImageType;
class MediaType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('imageFile', VichImageType::class, [
'required' => false,
'allow_delete' => true,
'download_uri' => true
])
->add('submit', SubmitType::class, [
'attr' => [
'class' => 'btn btn-success'
],
'label' => 'Upload File'
])
;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => Media::class,
]);
}
}
The Form is handled by this Twig template:
<div class="container-fluid">
<div class="row">
<div class="col-md-8 col-md-offset-2">
<div class="panel">
<div class="panel-body">
{{ form_start(form) }}
{{ form_widget(form.imageFile) }}
</div>
<div class="panel-footer">
{{ form_widget(form.submit) }}
{{ form_end(form) }}
</div>
</div>
</div>
</div>
</div>