Hello everyone on Blot blog, I need some help

Hello fellow Blot bloggers, I need some help with a technical issue. I have a Blot blog where I write only in Swedish. It’s very easy to publish a note (plain text with markdown) from the Dropbox app on Iphone but how do I do the same on desktop? I can’t find an easy way of writing a post in .txt and save it in the right folder on Dropbox. How do you do it?