Ok, There was WordPress Plugin but that plugin is outdated right now. Let me tell you an easy way.

Install PHP code plugins like insert php code snippet or similar plugins.

Then use this php code.

<?php
$query_images_args = array(
    'post_type'      => 'attachment',
    'post_mime_type' => 'image',
    'post_status'    => 'inherit',
    'posts_per_page' => -1,
);

$query_images = new WP_Query($query_images_args);

$gallery_items = '';
if ($query_images->have_posts()) {
    while ($query_images->have_posts()) {
        $query_images->the_post();
        $post_id = get_post_field('post_parent', get_the_ID());
        $post_status = get_post_status($post_id);
        if ($post_id && $post_status === 'publish') {
            $post_permalink = get_permalink($post_id);
            $image_url = wp_get_attachment_image_src(get_the_ID(), 'thumbnail')[0];
            $gallery_items .= '<a href="' . $post_permalink . '"><img src="' . $image_url . '"></a>';
        }
    }
}

echo '<div class="gallery gallery-columns-3 gallery-size-thumbnail" style="display: flex; flex-wrap: wrap; gap: 5px;">' . $gallery_items . '</div>';
wp_reset_postdata();
?>

Save the code, it will generate a short code to copy-paste where you want to show. It will show all images that post are published on your WordPress blog. If want to see a live example go here.

Hope it will help you.

Thanks.

Thank you so much sir, You are my game changer. I installed the plugin and setup the code, it is fully working. 👍 👍 👍 ❤️ ❤️ ❤️