Keep the ride moving.
The map is blank
Confirm the phone has a data connection, then reopen the Map tab. Trail lines and the visual basemap come from separate sources, so one may load before the other.
A route looks wrong
Use Report an issue from the route page. Include the trail number, what you observed, and the date. Posted signs and current land-manager orders always take priority.
The APK will not install
Open Android Settings → Install unknown apps and allow the browser or Files app you used for this one installation. Then open the downloaded APK again.
Vehicle or ride did not sync
Your change remains queued locally when the phone is offline. Sign in, reconnect, and leave TrailLink open briefly so the queue can retry.
Contact
The public support email must be connected to the publishing domain before launch. Until then, use the in-app issue report for trail data and the operations console for account support.