Hi, Zayed – thanks for your responsiveness. I don’t have the code anymore as I deleted both the code and the plugin and added a different plugin (that’s working for me). The code was copied directly from the Twenty20 how-to instructions, substituting image ID’s copied from the WP URLs for the photos I was using. I tried that with quite a few different image ID’s and even created a new post to try it out on a fresh piece. I also tried quitting WordPress and even rebooting my computer. What happened each time was…nothing. The shortcode and images didn’t appear in Preview or when I saved a post and tried looking at it on WP. Must be some gremlin biting me. Twenty20 worked beautifully for me before the gradual migration to Gutenberg. Now I can’t even get it to work in Gutenberg. Might be user error, but I’ve found a different plugin so am happy now.