How to Track iOS App Installs (Firebase Analytics ?)

Hello,

I’m trying to use firebase Analytics on my iOS app in order to use Conversion (installation) tracking.
I need this for Google Ads on iOS (no admob).
I’m try to add Firebase SDK C++. On iOS simulator, when launching my application, in the console, I have the following message : “UIApplication category for Firebase App”

Looks like it works…
But when I put my app on AppStore, no conversion on Firebase (analytics.google.com).
Does anyone have any ideas ?

Is there a solution other than used Firebase for installation Tracking on iOS ? (for google ads)
Thanks

Antony