When I create a draft for a new topic and then switch to my iPhone it automatically appears on my screen like this:
But if I start a reply on my computer and then go to finish it on my iPhone nothing automatically appears for me to finish it. I tried clicking reply on my phone, but that just wanted to make a new reply not access my draft reply.
Maybe this is a feature and not a bug, but since it was working for a new topic I thought it would would for replies as well.
I was able to do this twice on try.discourse.org once from my computer to my phone and another time from my phone to my computer.