Quote posts use :text, not :quote in Tumblr v2 api.
Put quote into the body of quote post types.
Use quote source as the file body field. That makes more sense, since source can accept full markdown or html, not just plain text.
Leave the quote post body alone. Save quote text as :quote.
Merge pull request #34 from elstudio/quote-posts-missing-quote

Quote posts missing quote