CoverageBook reports will always show the latest version when they're viewed online using the shared link to a book. But you'll need to generate a new PDF to update any changes made since the last time a PDF was downloaded.
In this example, the last PDF was generated 9 days ago. If you've made changes since then, click on Generate A New PDF to update it.
Select to show all images, or just the first image for each item and click on Generate PDF.
Your PDF will now be up to date.