I've shared my Project, but it doesn't seem to be updating my changes. Why?

Your browser may be displaying an earlier, saved version of your book. If you are re-sharing a book you had shared earlier, the web address is the same as the previous version and may be stuck in your web browser’s cache. Try clearing the cache in your browser (or doing a "hard refresh" - on a PC, press the Shift key on your keyboard and then click the Refresh icon in the browser) and then reloading the page to see the newest shared version of your book. 

Alternatively, saving a copy of your album and sharing that one would ensure the new shared preview shows the latest version.