According to the DEVONThink Blog (mail dot devontechnologies dot com/blog/tuesdaytipeditingoptionsindevonthink), “if a type of file can be edited in DEVONthink, it will open in a DEVONthink document window when the file is double-clicked.”
Having imported a bunch of markdown files from Ulysses.app, I find that when I double click on them, they open in DT, but any attempt to actually edit them produces nothing but a thunk sound.
Am I missing something here? Is there some setting that would allow me to edit these files, or must I convert these thousands of files into rtf or formatted note (not sure which is better) in order to make changes/apply styles?
No idea, I’m afraid, I have never had to do what you are trying. But you could batch convert all the files to .txt. You would lose the preview of the styling, but I’ve never found that a problem. I tend to have my markdown files with .txt extensions anyway.