For GA4 instructions set up with GTM tags please refer to the following article:
To connect your Google Analytics properly to Spotlightr, all you need to do is to provide its tracking ID inside Spotlightr Integrations.
Go to App Settings >> Integrations >> Add Integration where you will find the Google Analytics integration.
Once you have created the integration you can connect it with popular Spotlightr features, such as Opt-in, so you will receive notifications on that analytics integration when somebody opts in.
Additionally, you can connect it to the newly added View Notifications which will send you a notification whenever somebody watches the video.