Entity/Archivo.php
public function setFile(UploadedFile $file = null)
    {
        $this->file = $file;
        $this->setFechaPublicacion(new \DateTime());
    }
public function setFile(UploadedFile $file = null)
    {
        $this->file = $file;
        $this->setFechaPublicacion(new \DateTime());
    }
Sets file

@param UploadedFile $file