Add a way to preview a post

[AngeloStavrow]

Via Maique on Micro.blog (link):

I would love a way to preview the post. At the moment my write.as posts are written on iA Writer or Drafts, and I like to check if all the links are properly formatted, if images are showing up, bolds and italics ok, before copying the whole thing over to the browser window and hitting the publish button. I can still do the same, of course. But if the app is replacing both these apps, it would be helpful if I could preview the final result.