Children of POSTS and compiled PAGES will not export as their own webpages unless their $blogExpOpt contains OWNPAGE or FOOTNOTE. As a result, they will not appear when the Preview Tab is clicked in the Text Pane. To get around this problem, just check the Export All widget in the Styles Dash.

Export options that cause children to be compiled are COMPILE, BLOCKS, COLUMNS, and TABLE.

See also: Export All Widget