MetaBox Gallery Slider

mb_gallery_slider.php

<?php // ! DONT COPY THIS LINE

add_filter( 'rwmb_meta_boxes', 'oxyninja_mb_slider_gallery' );
function oxyninja_mb_slider_gallery( $meta_boxes ) {
    $meta_boxes[] = [
        'title'      => esc_html__( 'Gallery Slider', 'oxy-ninja' ),
        'post_types' => ['post', 'page', 'product'],
        'context'    => 'normal',
        'fields'     => [
            [
                'type' => 'image_advanced',
                'id'   => 'on_mb_gallery',
            ],
        ],
    ];
    return $meta_boxes;
}