Edit: I updated it through a USB connection to my laptop and the missing trails appeared! Problem solved, not sure how to delete my query.
How do I plan MTB routes so that I can see all Trailforks trails & know about any forks? I was using the map display on the navigation feature to follow a pre-planned route and missed a turn off on a trail because the fork on the trail was not on the map. The route was planned using open street maps which does not have all Trailforks trails on it. My Garmin didn't know there was a fork. I have installed Trailforks on the Garmin device & synced my account.