token = 'post'; if ( is_admin() ) { /* meta box html */ add_action( 'admin_menu', array( &$this, 'meta_box_setup' ), 20 ); /* necessary scripts and styles */ add_action( 'admin_print_styles-post.php', array( &$this, 'register_settings_styles' ) ); add_action( 'admin_print_styles-post-new.php', array( &$this, 'register_settings_styles' ) ); } } public function register_settings_styles() { $min = NULL; if( !WP_DEBUG ){ $min = '.min'; } wp_enqueue_style( 'unite-post-format-manager', FW_WEB_ROOT . '/core/admin/assets/css/unite-post-format-manager' . $min . '.css', false, UT_VERSION ); wp_enqueue_script( 'unite-post-format-manager', FW_WEB_ROOT . '/core/admin/assets/js/unite-post-format-manager' . $min . '.js', array(), UT_VERSION, true ); } public function meta_box_setup() { add_meta_box( 'ut-post-formats' , esc_html__( 'Post Format Settings' , 'unitedthemes' ), array( &$this, 'meta_box_content' ), $this->token, 'normal', 'default' ); } public function meta_box_content() { ?>

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Simply place a standard WordPress Gallery inside your editor. For further informations about how to setup a gallery please have a look here: Gallery Codex