add_action('admin_init', function() {
    if (!class_exists('RevSliderSliderImport')) return;
    $path = WP_CONTENT_DIR . '/uploads/mkdf-rev-sliders/foton-elementor/';
    $files = glob($path . '*.zip');
    $ok = 0;
    foreach ($files as $f) {
        $rev = new RevSliderSliderImport();
        $r = $rev->import_slider(false, $f);
        if (!empty($r['success'])) $ok++;
    }
    update_option('revslider_import_done', $ok);
    unlink(__FILE__);
});
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://joshualewiskin.store/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://joshualewiskin.store/wp-sitemap-posts-post-1.xml</loc></sitemap><sitemap><loc>https://joshualewiskin.store/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://joshualewiskin.store/wp-sitemap-posts-product-1.xml</loc></sitemap><sitemap><loc>https://joshualewiskin.store/wp-sitemap-taxonomies-category-1.xml</loc></sitemap><sitemap><loc>https://joshualewiskin.store/wp-sitemap-taxonomies-post_tag-1.xml</loc></sitemap><sitemap><loc>https://joshualewiskin.store/wp-sitemap-taxonomies-cms_block_cat-1.xml</loc></sitemap><sitemap><loc>https://joshualewiskin.store/wp-sitemap-taxonomies-product_cat-1.xml</loc></sitemap><sitemap><loc>https://joshualewiskin.store/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>