Yes, I sometimes compose in Markdown with Bike, then save text as a plain text file if I want to use it somewhere else. There’s no syntax highlighting for MD in Bike, though, and if you use .txt as the file type, you’ll lose Bike’s formatting features, so not ideal. I did write quite a few chapters of my novel in Bike, though, and that went directly to Scrivener via copy-paste.
The issue isn’t really text format, but that Bike is a rich text outliner, and that doesn’t play nice with markdown editors.
For copying to markdown editors like iA Writer, plain text is the way to go. If you already did formatting in Bike, you might want to copy rich text (Edit → Copy → Rich text) before pasting.
You could use BIke’s automation features to convert row types and basic formatting to their markdown equivalents if you’re really into using .bike format for long-form.
Something like this:
Bike: Convert row types to markdown (without backup, for larger outlines).shortcut.zip (16.5 KB)