Supporting this one. Just like the iOS-app does it: In-App-Preview (markdown as well).

I mostly use Textastic on iOS for editing synced (sftp/webdav) markdown-files. The neat preview and the sync-option via different protocols are the most important features for an easy to use, quickly accessible, short path to work, slim-looking editor.

So I totally support the request to add the connection-types and sync-option, the iOS app provides.