Can I add the gallery to more than one page?
Yes, and you can specify different 500px.com usernames with the “user500px” shortcode param. To optimize your website loading times, with the “Gallery page” option you can also specify all the ids or permalinks pages on which the needed scripts must be loaded.
Why I didn’t see all my 500px photos?
The photos displayed are only the latest ones, as published in the user feed by 500px.com.