Thanks for checking it out! The Alice link is a generated m4b, so it’s sample output that you could likely play back directly in your browser, although that may not have the cover display or chapter listing. I recommend Apple Books or Plappa on iOS, or Audiobookshelf on Android. For desktop, VLC still rules the day for general media playback, but Audibly is a Windows app that has good reviews.

There are many public domain epub files online which you could use as input. One excellent source is https://www.gutenberg.org/