Is there an option where I can upgrade my old google analytics with the new UI (web and app) or they have completely different function.
I have data in my existing google analytics, events created in it.
When I try to make a new analytics from firebase it create a new property or a new account and no data shows in the new analytics. How can I have the new analytics upgrade with all my existing data or I have to update the website with new code.
OLD Google Analytics
NEW GOOGLE ANALYTICS
These are two completely different systems, using a different data model collection (sessions and pageviews vs users and events).
Here you can find instructions to set up a Google Analytics 4 property (formerly known as an App + Web property) alongside your existing Universal Analytics property: https://support.google.com/analytics/answer/9744165?hl=en
The documentation said:
By connecting, you'll be able to take advantage of future upgrade tools to assist with other configurations
This confirms that this functionality probably still rolling out. So, until that moment (we don't know when it will be and we don't know how it will migrate), the configuration of Google Analytics 4 (App+Web) must be done by hand.
Here you can find the best practices for setting up ecommerce data collection in Google Analytics 4 properties: https://support.google.com/analytics/answer/10119380
