Only certain pages are not showing up in the preview What's the problem?

I registered a new page in Pages and previewed it, but the newly registered page does not appear in the preview. What’s the problem?

The prototype’s HTML Generator defines which pages are published/previewed. By default, the “Publish all pages” option is checked, but once individual pages are chosen, newly added pages are not selected/checked by default.

In Axure RP, go to Publish > Generate HTML Files… and look at the Pages tab.