Thank you for this recommendation. Joplin didn't allow me to manage the files manually, but this gives me far more control. As a bonus, it supports todo.txt, which I was already using. Paired with Dropsync, this is my find of the month.

This is what I'm using now, and it seems to be working well although I'll point out that it is nagware. I'll put up with the intermittent begging for donations over ads, in-app purchases, and data mining you'd find on other apps.