Restrict access to the media library in WordPress.

functions.php

// Limit media library access
  
add_filter( 'ajax_query_attachments_args', 'wpb_show_current_user_attachments' );
 
function wpb_show_current_user_attachments( $query ) {
    $user_id = get_current_user_id();
    if ( $user_id && !current_user_can('activate_plugins') && !current_user_can('edit_others_posts
') ) {
        $query['author'] = $user_id;
    }
    return $query;
}