How does Marked Preview work?
I wish I could figure out how to delete a post because I solved my problem just by READING THE UPDATE NOTES PROPERLY haha.
Anyway, in case anyone else has the same problem:
I just downloaded update (1.5.3) and there is a new menu option to 'Stream preview to Marked' 2. Make sure the option is ticked in The Archive preferences (Advanced) and also in the Note menu.
Now open Marked 2 and choose Preview/Streaming Preview (this is the bit I didn't read properly at first).
Now, whenever you make changes to a note in The Archive or move to a different note, you will instantly see the preview in Marked 2.
This is much more responsive than the old Open in External Editor way of using Marked with the Archive (which is still available). The old way will reflect live changes made to the note but will not automatically change notes according to which one you select in the Archive.