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I'm unclear why the earlier review said this didn't work, but this works perfectly with WP vanilla block editor (Gutenberg) in version 5.5.1. It's one of the few that is free, doesn't require Elementor, Divi or WPBakery layout plugins/themes, and doesn't break Smart Slider 3. That being said, it does conflict with the JavaScript Bootstrap pull-down menu in themes that are based on Bootstrap 4.x and the Bootstrap navwalker AND have pull-down menus. I can't use it for that reason, but if that isn't something you need to worry about, this might work for you. I also can't confirm if this works with NextGen Gallery or other similar image sliders or slideshow plugins. Be sure to test those immediately after you install and activate this.

This plugin is small and works very good. But it's not realy Gutenber compatible.