Thanks for the replies, and sorry for my slow response! I’ve been busy with other work for the past few weeks, but now I’m returning to this problem.
The video didn’t solve the problem and, unfortunately, Writage is only available for windows and I run a mac. To be clear, I need to copy and paste repetitively paragraphs of text. Simple export to Word files won’t work.
Oddly enough, if I paste the markdown flavored plain text into an online markdown editor and then copy their formatted text, the text flows fine in word. (I just tested it with https://dillinger.io/ but there are probably others.) So, it seems to me to be a problem with Obsidian’s preview function.