Humboldt is an application that enables you to post HTML and upload images to Micro.blog. This enables you to build simple Shortcuts that enable hand-free posting to Micro.blog. You can also build more complex Shortcuts that import posts from other blogging systems.
All you have to do is supply Humboldt with your Micro.blog account email and Humboldt will walk you through the sign-on process. You'll then be ready to start building your Shortcuts.