JezK

Edit File: class-rank-math-seo-sitemaps.php

<?php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Adds support for Rank Math SEO Sitemaps
 *
 * Created by Rank Math.
 * Date: 27/09/2019
 */
if ( ! class_exists( 'FooGallery_RankMath_Seo_Sitemap_Support' ) ) {

class FooGallery_RankMath_Seo_Sitemap_Support {

function __construct() {
			add_filter( 'rank_math/sitemap/urlimages', array( $this, 'add_images_to_sitemap' ), 10, 2 );
		}

function add_images_to_sitemap( $images, $post_id ) {
			//check the content for $post_id contains a foogallery shortcode

//get all the foogalleries used in the posts
			$galleries = get_post_meta( $post_id, FOOGALLERY_META_POST_USAGE );
			if ( is_array( $galleries ) ) {
				foreach ( $galleries as $gallery_id ) {

//load each gallery
					$gallery = FooGallery::get_by_id( $gallery_id );

if ( false === $gallery ) {
						continue;
					}

//add each image to the sitemap image array
					foreach ( $gallery->attachments() as $attachment ) {
						$image    = array(
							'src'   => $attachment->url,
							'title' => $attachment->caption,
							'alt'   => $attachment->alt
						);
						$images[] = $image;
					}
				}
			}

return $images;
		}
	}
}

https://looker.af/wp-sitemap-posts-post-1.xmlhttps://looker.af/wp-sitemap-posts-page-1.xmlhttps://looker.af/wp-sitemap-taxonomies-category-1.xmlhttps://looker.af/wp-sitemap-users-1.xml