You can now add clickthrough or swipe through galleries to your content.
Hit the insert images icon in the markdown editor to begin, and then select the images you want to include from your media gallery.
You'll then see a dialogue where you can edit the order of the images plus add descriptive text, titles and caption.
You can choose between a traditional image Gallery or a numbered How-to (sometimes called a Step by Step). These are subtly different and will also be marked up differently using Schema which means Google will see them slightly differently.
Once you've set things up as you want the markdown will be generated for your Gallery or How-to. If you want to change things just highlight that block of markdown and hit the insert media icon and you'll be taken back into the edit Gallery or How-to dialogue.
Remember, as with all content you put into Malcolm! you can surface your Gallery or How-to's in multiple ways - as well as your hosted hub pages they will work in pop up widgets, drawers, overlays and inline page embeds.
See the below video for a walkthrough: