MetaSlider has full support for the Classic Editor plugin in WordPress. You can add MetaSlider slideshows to Classic Editor posts using the button we provide over the editor area. You can see that button in the screenshot below:
Once you click this button, you’ll see a modal pop-up with an option to choose the slideshow you want. You can see that modal in this next screenshot.
After you choose your slideshow, MetaSlider will insert the correct shortcode for this slideshow, as in the screenshot below.