Get universal link URL

Hello everyone, i'm currently working on implementing Universal Link on our iOS build, i've added the apple-app-site-association file and associate domains in Xcode, my app can successfully invoked by the URL, but i'm not able to get the URL string which invoked my app.

I've done a lot of researches and it seems i need to implement
"
application:continueUserActivity:restorationHandler:
"
this method in AppDelegate, i've tried to add it in UnityAppController, but it doesn't work, does anyone konw where should i put it or what else should i do?

 

Update

i tried to create a brand new project and put the method in UnityAppController, it works!
so is it because i'm using other plugins, like Facebook SDK, Google SDK, did anyone have the same problem?