I have a website that is running the Universal Analytics (UA) version of Google Analytics. I would like to add support for Google Analytics 4.
The documentation for adding Google Analytics 4 support asks me to add a
gtag.js script to my web pages. If I want to continue using UA, do I need to use both
gtag.js, or can I just replace the
analytics.js tag with
gtag.js because it will be enough to supply data to both UA and GA4?