How to Use One Writer to Automate Your Workflow

I'm always looking around because my workflow right now is still Dropbox based essentially it's plain text in Dropbox it's Markdown in Dropbox so I have a folder called stories and I can have them in BB edit on my Mac and whatever text editor app I'm using on my iPad. There's no BB edit for iOS right I need something that that will round trip with Dropbox, there are some apps that are like it's great we have our own little iCloud folder but the truth is I don't want that right and I'm not. So I end up really needing it to just be a very nice markdown text editor that can look in a Dropbox folder or you know in the long