I created a checklist on Mac app and then went to use my iOS app. I was able to check the box, but when I hit "return" on iOS, it made a new line but did not include a check box.
I then made a test checklist on iOS and checked it on my mac and sure enough, it shows up as a bulleted list with a checkbox as the first character on the line. screenshots of the same note on iOS and Mac OS attached.