In the thread I linked to, I think there was some discussion of glitches on iPad when working in split view, causing text in DTTG to be lost when trying to open it in iA Writer, for example. Maybe that’s now been fixed, I’m not sure. For me, in macOS opening md files from DT to iA Writer has worked flawlessly, they always get saved properly back in DT. On iOS it’s a little less clear to me how/when iA Writer saves the files back into DTTG so it makes me a little nervous, even though so far I haven’t had a problem. Ideally, I’d feel more comfortable having a nicer-looking edit view in DTTG so I can just stay there.