Using Pro version. Shortcode [3d-flip-book mode="thumbnail-lightbox" cols="3" tax-title="true"]. cmdSave is enabled=yes in both Global Settings and per-book Control properties, but the cmdSave button never renders in DOM, and downloadURL never appears in the page source at all. Is this a known limitation of thumbnail-lightbox + taxonomy gallery mode?
Found it — it was a global/outer-level toolbar setting overriding the per-book Control properties, not a plugin bug. Resolved.