It's fairly simple - unlike Tapastic, who encourage you to break very long vertical comics up in chunks, on Patreon you can only upload one image per post, so you simply.... make a vertically scrolling comic and post it on Patreon. It will make scrolling through your archive of posts on Patreon a bit time-consuming, especially since Patreon doesn't have a search-function for posts, or any way to organise posts in a folder-system, but it works.
I do my Q&A-comics and my between-chapter sketch-comics in a vertical format and post them on Patreon, and it's been working out okay so far. I can't link you to any of them, unfortunately, because they're all locked for backers.
A few things to keep in mind generally for vertically scrolling comics, regardless of platform:
1.) Try to format your panels in such a way that I as the reader can see the top and the bottom of the panel without having to scroll down. Unless you're trying to do an intentional vertical camera sweep (to show, say, someone falling off a cliff, or something dropping down a hole, or falling from the sky, or whatever), you're going to want your readers to be able to scan an entire panel in one go.
2.) Try to not make the episode/comic strip too long. Scrolling is fine, but readers won't want to scroll forever to get to the comment field/author's note.
3.) As always, study other vertical format-comics, and see what works and what doesn't. Find ones you like, and try to figure out what makes them work. In my experience, humour-based comics usually do better in vertical format than more drama-based ones, but there are some great vertical-format drama-comics too, so it's all a matter of figuring out how to make them work.
