vich_uploader:
    db_driver: orm
    mappings:
        image_uploads:
            uri_prefix: '%path.image_uploads%'
            upload_destination: '%kernel.project_dir%/public%path.image_uploads%'

parameters:
    path.image_uploads: '/assets/images/uploads'

ContactPage:
   class: AppEntityContactPage
   label: 'Contact'
   list: //image not shown
      fields:
         - 'title'
         - 'content'
         - { property: 'image', type: 'image', basePath: '%path.image_uploads%' } //I also tried with the public prefix
  form: //works as intended
      title: '%%entity_label%%'
      fields:
         - 'title'
         - { property: 'content', type: 'FOSCKEditorBundleFormTypeCKEditorType' }
         - { property: 'imageFile', type: 'vich_image', basePath: '%path.image_uploads%'  }
         - { property: 'imageAlt', label: 'Alt tag' }
  show: //image not shown
       title: '%%entity_label%%'
       fields:
          - 'title'
          - 'content'
          - { property: 'image', type: 'image' }
          - { property: 'imageAlt', label: 'Alt tag' }

use VichUploaderBundleMappingAnnotation as Vich;
use SymfonyComponentHttpFoundationFileFile;


/**
 * @ORMEntity
 * @VichUploadable
 */
class ContactPage
{
    /**
     * @ORMColumn(type="string", length=255, nullable=true)
     * @var string
     */
    private $image;

    /**
     * @VichUploadableField(mapping="image_uploads", fileNameProperty="image")
     * @var File
     */
    private $imageFile;

    /**
     * @return string|null
     */
    public function getImage(): ?string
    {
        return $this->image;
    }

    /**
     * @param string|null $image
     * @return ContactPage
     */
    public function setImage(string $image): self
    {
        $this->image = $image;

        return $this;
     }

    /**
     * @return File|null
     */
    public function getImageFile(): ?File
    {
        return $this->imageFile;
    }

    /**
     * @param File $imageFile
     */
    public function setImageFile(File $imageFile = null): void
    {
        $this->imageFile = $imageFile;

        if ($imageFile) {
            $this->updatedAt = new DateTime('now');
        }
    }
}