Q: How do I build a GA4 audience and push it to Google Ads for remarketing?

A: Audiences only export once the Ads link exists:
— Admin → Product links → Google Ads: confirm linked and 'Personalized advertising' is on.
— Admin → Audiences → New audience → build the rule (e.g. add_to_cart in last 7 days AND no purchase).
— Set membership duration (max 540 days) and a clear name.
— Save — it starts populating from today; GA4 backfills up to 30 days of qualifying users where possible.
— Check Ads → Shared library → Audience manager for the synced segment within ~24-48h.
TL;DR: Link Ads first, build the rule under Admin → Audiences, save, then find it in Ads Audience manager a day later.
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