src/Entity/FileEntity.php
public function getResource()
    {
        if ($this->file instanceof \Doctrine\MongoDB\GridFSFile) {
            return $this->file->getMongoGridFSFile()->getResource();
        }
        return null;
    }
public function getResource()
    {
        if ($this->file instanceof \Doctrine\MongoDB\GridFSFile) {
            return $this->file->getMongoGridFSFile()->getResource();
        }
        return null;
    }
Gets the resource of a file

@return null|\stream