In the following thread, it seems the latest update fixed the active track issue for iphone x but it still doesn't work on iphone 7. Could DJI please also test your product on other phones and fix the problem? https://forum.dji.com/thread-134010-1-1.html

Hi Si300414, I have tested my iPhone and it works, please start Hyperlapse firstly and then select an object to use Active Track function.

DJI Mindy Posted at 2018-2-11 19:36
Hi Si300414, I have tested my iPhone and it works, please start Hyperlapse firstly and then select an object to use Active Track function.

Have you tested on iphone 7 with ios 11.2.5?

DJI Mindy Posted at 2018-2-11 19:36
Hi Si300414, I have tested my iPhone and it works, please start Hyperlapse firstly and then select an object to use Active Track function.

Unit type: Osmo Mobile 2
Unit Firmware Version: 2.1.0.20
Mobile Device Model and OS version: iPhone 7 iOS 11.2.5
DJI GO Version: 3.1.28(2861)

Si300414 Posted at 2018-2-11 20:55
https://youtu.be/CgmRggAStGc

Unit type: Osmo Mobile 2

I mean ''start'' the Hyperlapse firstly to make sure it is recording, then select the Activa Track. Please check the screenshot.

ok, it works now. Thanks.