Ensure that the scrolling frame is named properly:

  • in your layers palette, rename the page's scrolling text frame (i.e. ''vertscroll-text'')
  • then name the expanded that's on the '-scrollable' layer with the same name
  • Export again and your page's text should display correctly

For more info, please check - http://docs.appstudio.net/display/AppStudio/Vertical+scrolling+text+columns