For WordPress, Add a Metabox to List Attachments in the editor. Works on posts, pages & custom post types. - https://snipsnip.pro/s/724

AddPostAttachmentsMetaBox.php

// Add a Metabox to List Attachments in the editor - https://snipsnip.pro/s/724
if (!class_exists('AddPostAttachmentsMetaBox')) {
    class AddPostAttachmentsMetaBox {
        public function __construct() {
            add_action('add_meta_boxes', array($this, 'add_metabox_of_post_attachments'));
        }

        public function add_metabox_of_post_attachments() {
            $post_types = get_post_types(array('public' => true), 'names');
            foreach ($post_types as $post_type) {
                add_meta_box('att_thumb_display', 'Attachments', array($this, 'generate_list_of_post_attachments'), $post_type);
            }
        }

        public function generate_list_of_post_attachments($post) {
            $args = array(
                'post_type' => 'attachment',
                'order' => 'ASC',
                'numberposts' => -1,
                'post_parent' => $post->ID
            );

            echo '<ul>';
            foreach (get_posts($args) as $key => $image) {
                $imgSRC = esc_url(wp_get_attachment_url($image->ID));
                $post_mime_type = esc_html($image->post_mime_type);
                $edit_link = esc_url(get_edit_post_link($image->ID));

                echo '<li style="display: flex;align-items: center;">' . $key . ': ' . $post_mime_type . '<a href="' . $imgSRC . '" target="_blank" style="margin-left:1rem;display: flex;align-items: center;"><img style="max-width:150px;margin-right:1rem;" src="' . $imgSRC . '">' . $imgSRC . ' ↗</a> <a href="' . $edit_link . '" target="_blank" style="margin-left:1rem;">EDIT</a></li>';
            }
            echo '</ul>';
        }
    }

    new AddPostAttachmentsMetaBox();
}

For WordPress, Add a Metabox to List Attachments in the editor. Works on posts, pages & custom post types.
Add the code to your functions.php file or use Code Snippets Pro - Read more at: https://snipsnip.pro/s/724