I am working with Alfresco Activiti that has Aspose Words 15.5.0. I am using Activiti/Aspose to build an epub document from html. I am able to successfully create an epub with table of contents, however the built in navigation points are missing for certain entries (but corresponding entries are correct in the TOC). In my document.ncx and the corresponding html files I am able to see the nav points, but as soon as I hit level 4 heading entries, there are no longer any nav points. So all level 1-3 nav points are working just fine, but it seems like level 4 nav points are not working (have not tried this with any levels after 4). Is there some limitation on the level that a nav point can be? Is this the intended behavior? Is there any way to add/delete nav points?