Add other roles/capabilities

I’m using the Membership plugin and want to give members the ability to add their own avatars. Their user role is not Contributor or Subscriber but ‘ctmembers’. How can I add this role to the plugin to allow them to add/edit avatars?

They don’t have any post editing capabilities but are able to see premium/membership-only posts.

Right now, custom avatar uploads are only working for Admins/Editors, not our members.

I updated this in class-wp-avatar-user-subscriber.php but it did not work:

public function wpua_subscriber_capability() {
    global $blog_id, $wpdb, $wpua_allow_upload, $wpua_edit_avatar;
    $wp_user_roles = $wpdb->get_blog_prefix($blog_id).'user_roles';
    $user_roles = get_option($wp_user_roles);
    if((bool) $wpua_allow_upload == 1 && (bool) $wpua_edit_avatar == 1) {
      $user_roles['subscriber']['capabilities']['edit_posts'] = true;
      $user_roles['ctmembers']['capabilities']['read'] = true;
    } else {
      unset($user_roles['subscriber']['capabilities']['edit_posts']);
      unset($user_roles['ctmembers']['capabilities']['read']);
    }
    update_option($wp_user_roles, $user_roles);
  }
}

https://ww.wp.xz.cn/plugins/wp-user-avatar/