I just set up Google Tag Manager in my project and would like to test iOS/Android using the Preview Mode that's available for browser. Starting with Android I followed the instructions here and was able to use the link successfully but I don't see any kind of Preview Mode. Where are the log messages that I would normally see if I used it on browser and how do I get to them? Thanks!
Preview mode in mobile doesn't work as similar in web.
You need to verify your changes from Logcat/Android Monitor or Xcode Console for which you have enable verbose logging.
Instructions to open container and see verbose logs;