What campaign type and Smart Bidding strategy should an advertiser set up in a Google Ads campaign in order to show ads across YouTube, Discover and Gmail feeds to get as many sales as possible within a set budget?

This campaign needs the Google feed-based campaign family that serves across YouTube, Discover, and Gmail, not a retail-only setup or an objective by itself. The bidding method should optimize for the highest possible number of conversions within the available budget, which fits a sales-volume goal better than a value-based return goal. A value-focused strategy would prioritize conversion value, not the total number of sales. In current Google Ads documentation, this inventory is covered by Demand Gen campaigns, which replaced the earlier Discovery campaign naming