Is it possible to modify the media library admin screen?

That area of all admin screens is where admin notices are displayed, so you could generate an admin notice. Here’s a suitable function and hook: function wpse_233031_admin_notice() { ?> <div class=”notice notice-info”> <p>Your message here!</p> </div> <?php } function wpse_233031_hook_admin_notice() { add_action( ‘admin_notices’, ‘wpse_233031_admin_notice’ ); } add_action( ‘load-upload.php’, ‘wpse_233031_hook_admin_notice’ ); /* Edited out anonymous function …

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