注册自定义帖子类型：

$labels = array(
  \'name\' => \'tananyags\',
  \'singular_name\' => \'etananyag\',
  \'menu_name\' => \'E-Tananyagok\',
  \'name_admin_bar\' => \'Add new\',
  \'add_new\' => \'Add New\',
  \'add_new_item\' => \'Add New Item\',
  \'new_item\' => \'New\',
  \'edit_item\' => \'Edit\',
  \'view_item\' => \'View Item\',
  \'all_items\' => \'All\',
  \'search_items\' => \'Search\',
  \'parent_item_colon\' => \'Parent: ??\',
  \'not_found\' => \'No item found\',
  \'not_found_in_trash\' => \'No item found in the trash\',
);

$args = array (
  \'labels\' => $labels,
  \'public\' => true,
  \'publicly_quaryable\' => true,
  \'show_ui\' => true,
  \'show_in_menu\' => true,
  \'query_var\' => false,
  \'hierarchical\'  => false,
  \'capability_type\'     => array(\'etananyag\',\'tananyags\'),
  \'has_archive\' => true,
  \'menu_position\' => 7,
  \'rewrite\' => array( \'slug\' => \'etananyag\'),
  \'supports\' => array( \'title\', \'editor\', \'thumbnail\'),
  \'taxonomies\'  => array( \'category\' ),
  \'menu_icon\' => \'dashicons-book-alt\',
  \'show_in_rest\' => true,
  \'capabilities\' => array(
    \'edit_post\' => \'edit_etananyag\',
    \'read_post\' => \'read_etananyag\',
    \'delete_post\' => \'delete_etananyag\',
            \'edit_posts\' => \'edit_tananyags\',
    \'edit_others_posts\' => \'edit_others_tananyags\',
    \'publish_posts\' => \'publish_tananyags\',
    \'read_private_posts\' => \'read_private_tananyags\',
    \'read\' => \'read\',
    \'delete_posts\' => \'delete_tananyags\',
    \'delete_private_posts\' => \'delete_private_tananyags\',
    \'delete_published_posts\' => \'delete_published_tananyags\',
    \'delete_others_posts\' => \'delete_others_tananyags\',
    \'edit_private_posts\'  => \'edit_private_tananyags\',
    \'edit_published_posts\' => \'edit_published_tananyags\',
    \'create_posts\' => \'edit_tananyags\'
        ),
  \'map_meta_cap\' => true
);

register_post_type(\'tananyag\', $args);

创建新角色（几乎与作者相同）：

    add_role( \'e_tananyag\', \'E-Tananyag\', array(
    \'upload_files\' => 1,
    \'read\' => 1,
    \'level_2\' => 1,
    \'level_1\' => 1,
    \'level_0\' => 1,
  ));

为新角色分配自定义功能：

    $tananyag_role = get_role(\'e_tananyag\');
$tananyag_role->add_cap(\'edit_tananyags\', true);
$tananyag_role->add_cap(\'delete_tananyags\', true);
$tananyag_role->add_cap(\'edit_published_tananyags\', true);
$tananyag_role->add_cap(\'publish_tananyags\', true);
$tananyag_role->add_cap( \'delete_published_tananyags\', true );
$tananyag_role->add_cap( \'read_etananyag\', true );
$tananyag_role->add_cap( \'edit_etananyag\', true );
$tananyag_role->add_cap( \'delete_etananyag\', true );

一切正常，用户和角色etananyag 可以查看、编辑或修改ctp，但他根本无法添加特色图片。

请帮忙