I would like the “Preview in Marked” feature added, similar to Bear. Marked is useful for additional styling and exporting.
1 Like
Oh, interesting, Marked so early 
Since you ask, what part of manually opening a file do you find most cumbersome? After all, you could get by with dragging into Marked to get the preview going. (To clarify for other readers who get here mostly.)
Imagining you never had the Bear experience, what would your ideal integration feel like? You start in Lettera 
and now you want better printing, so … (what happens next)?
I usually drag files to Marked via their proxy icon. But it’s a two-step process here, since the proxy icon isn’t visible until you click the document title. In my case, I often work with documents that are on iCloud Drive, but that I open from iA Writer, so it’s several clicks to get to them in the Finder.
In my case, it’s often to use HTML generated by Marked from articles I write in Markdown, which then go into a CMS. Exporting to HTML then opening the resulting files is a multi-step process that is more cumbersome than just copying the HTML code from Marked.