[Plugin: Google XML Sitemaps] How can i include nextgen gallery page to sitemap?

for example : if i add gallery with new post, it included automaticly sitemap like https://www.sitename.com/post_id/post_name

in this post gallery have exstra pages like, https://www.sitename.com/photo-gallery/post_name/image_id/

How can i include all of nextgen gallery pages to sitemap with google xml sitemap?

PS : i use last version of plugins and wordpress