Syncing hiccups

I have used OmniOutliner Pro for years on my Mac but only recently thought of trying out the iOS app. I have a trial version but am finding syncing a bit unreliable. I have Omnipresence running on my Mac and my file is in the Omnipresence folder. What I find, though, is that I have to repeatedly open the document for the changes I made on the Mac to show up on the iPhone.

Is there some trick to getting it to reliably sync. Like, do I have to quit OmniOutliner on the Mac? Close documents on both devices and reopen them?