The App Store gives you three tools for showing the right screenshots to the right people. All three reuse sets you make here.
Put the decision in the first three
In search results, iPhone users see the first three portrait screenshots next to your icon. Many decide there without opening the product page. Lead with the core task the app does, then the feature that sets it apart, then proof such as a result screen. Settings, onboarding and login screens belong at the end or nowhere.
Custom Product Pages
A Custom Product Page is an extra version of your product page with its own screenshots, app previews and promotional text, reached through a unique URL. Use one per ad campaign or audience. A fitness app could run a "home workouts" page whose first screenshot is the workout player, and a "meal tracking" page that opens on the food log. Generate each set in AppMockup with the matching screen first.
Product Page Optimization
Product Page Optimization tests up to three alternative screenshot sets against your default page with a share of organic traffic, and App Store Connect reports which converts better. Change one thing per test, such as the first screenshot or the headline style, so you know what caused the difference.
Localized sets
Each App Store localization has its own screenshots. Translated headlines in the image matter as much as translated metadata, because the image text is what people read first. On the Pro plan, AppMockup can rewrite a finished set's headlines for another language while keeping the design.