nameCallback not renaming photos

nameCallback.php

       $this->addBehavior('Josegonzalez/Upload.Upload', [
            // You can configure as many upload fields as possible,
            // where the pattern is `field` => `config`
            //
            // Keep in mind that while this plugin does not have any limits in terms of
            // number of files uploaded per request, you should keep this down in order
            // to decrease the ability of your users to block other requests.
            'photo' => [
                'fields' => [
                    // if these fields or their defaults exist
                    // the values will be set.
                    'dir' => 'photo_dir', // defaults to `dir`
                    'size' => 'photo_size', // defaults to `size`
                ],
                'nameCallback' => [$this, 'renameUploadedPhoto'],
                // This can also be in a class that implements
                // the TransformerInterface or any callable type.
                'transformer' => function (\Cake\Datasource\RepositoryInterface $table, \Cake\Datasource\EntityInterface $entity, $data, $field, $settings) {
                    // get the extension from the file
                    // there could be better ways to do this, and it will fail
                    // if the file has no extension
                    $extension = pathinfo($data['name'], PATHINFO_EXTENSION);
                    // Store the thumbnail in a temporary file
                    $tmp = tempnam(sys_get_temp_dir(), 'upload') . '.' . $extension;
                    // Use the Imagine library to DO THE THING
                    $size = new \Imagine\Image\Box(40, 40);
                    $mode = \Imagine\Image\ImageInterface::THUMBNAIL_INSET;
                    $imagine = new \Imagine\Gd\Imagine();
                    // Save that modified file to our temp file
                    $imagine->open($data['tmp_name'])
                        ->thumbnail($size, $mode)
                        ->save($tmp);
                    // Now return the original *and* the thumbnail
                    return [
                        $data['tmp_name'] => $data['name'],
                        $tmp => 'thumbnail-' . $data['name'],
                    ];
                },
            ],
        ]);
        
        
    public function renameUploadedPhoto(array $data, array $settings)
    {
        $ext = substr(strrchr($data['name'], '.'), 1);
        return Text::uuid() . '.' . $ext;
    }