Not sure if this is an iOS app issue or desktop app issue.
I made a couple of highlights in my text in Accordance 12.1.4. Also made a couple of notes on the verse and then hit the dropbox sync in Accordance. I then went to my phone to pull the changes down to it and the only thing that synced to iOS were the notes. The highlights did not. When I hit the sync button again, iOS said nothing to sync.
So, I made a couple of extra highlights on my phone and hit the sync button. It sent the changes to the file in dropbox showing that the file had just changed. However, when I hit sync in Accordance on my laptop, no highlight changes were brought in.
I then made some notes changes on my phone, sent the changes to Dropbox, and pulled those note changes onto Accordance, but again still no highlight syncing even though any highlight changes I make in either app shows the file is being changed and updated in the Dropbox folder.