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On the “Installation Instructions” page click “Install Manually”. The page should then display the text that you need to add to each HTML page in your application. The correct tag ID will already be in the text. You can copy this text and paste it into the web page at the appropriate location, replacing the analytics.js text.
Once the gtag.js tagged page is deployed to production, data should be visible in GA4 and UA in around 30 minutes. The UA data will cease collection on July 1, 2023.