How ads are created
Apple Search Ads Basic uses the app name, subtitle, description, preview videos, and screenshots approved for your App Store product page to create your ad. The first sentence of your App Store product page description is the most important — this is what users can read in your ad without having to tap to read more. If you change your App Store metadata, it can take up to 24 hours to be reflected in the ad preview within your account, and up to two hours for it to be reflected in your ad on the App Store.
Tip: Review app metadata.
Since ad content relies on metadata, take the time to review your app metadata in App Store Connect before you start.