When I tried this the first time I used each line of the outline as a paragraph. Maurice Parker, the developer of Zavala, answered my call for help.
when you craft your blog post in Zavala, the Topics are headings and the Notes are the paragraph text. Make sure that when you export from Zavala you select the Markdown Doc format. It looks like you exported an outline without Notes using the Markdown List option.
So it seems I made not one, but two, mistakes.
Now I Try Again
So this time, I’ve only got two outline nodes representing the headings, and text in the notes fields for my paragraph.
Into the breach once more, I go.