How to manage files after switching from Drive to Dropbox

I've moved my site's synced folder from Google Docs stored in Google Drive to markdown files in Dropbox.

Putting markdown files into Dropbox is working just fine - they are rendering on the site. And our old posts are also still rendering on the site, which is also great.

However I can't figure out how we might edit / delete those old posts - the Drive folder is disconnected, but they aren't in the Dropbox folder either. How can we do some file management there? Ideally I'd be able to replace the GDoc originally published with a markdown file with the same url slug metadata into Dropbox.