UnityARWorldMap example - worldMap not being saved on iPhone/iPad

SOLVED: Hadn't realized I needed iOS 12 beta. Working fine now

I've been trying to get the UnityARWorldMap example to work. However, when I tap the Save button, nothing happens. In WorldMapManager.cs, Save() calls OnWorldMap:

Code (CSharp):

1. void OnWorldMap(ARWorldMap worldMap) {
2.       if (worldMap != null) {
3.            worldMap.Save(path);
4.            Debug.LogFormat("ARWorldMap saved to {0}", path);
5.       }
6. }

The debug statement never appears, meaning that worldMap = null.

Tried running on both iPhone 6 and iPad Pro. Same results.

Any help would be appreciated.

 

Stuck on the same problem. Could somebody help us out?

 

Got it. The ui-button was not connected with the script!