Start with screenshots that demonstrate your actual app, then build a small sequence around its main benefit. A device mockup can help with the visual presentation, but the final store assets still need the correct dimensions and must meet the store's current requirements.
Write the sequence before designing
For a task app, a useful starting sequence is: today's work, adding a task, planning the week, and the completed result. These are suggested story beats, not a required number of images. Each frame should answer a different question about the app.
Capture the real interface
Use a consistent demo account and replace personal details with fictional data. Keep the interface language and state consistent across captures. Do not show features your submitted app does not offer.
Protect readability
Check the composition at phone size. If a device frame makes the actual interface too small, use a closer crop or a direct screenshot. Keep explanatory text short and avoid covering the part of the app that proves the benefit.
Separate store screenshots from promotional videos
freemockup.video creates device visuals and animations for your campaign. It is not an automatic App Store submission validator or a complete localization/layout system. Do not assume that a 4K marketing video or its poster frame has the correct dimensions for a store screenshot or app preview.
Check the current upload specification
Use Apple's screenshot specifications for the device family you are submitting, and check app-preview requirements separately if you are uploading video. Keep the original captures so you can recreate the right sizes when requirements or your interface change.
Questions before you start
Should every screenshot show a device frame?
No. Choose the treatment that makes the actual app easiest to understand. Review the set at its final viewing size.
Can I reuse my launch video as an app preview?
Only after checking the store's separate content and technical requirements. A promotional mockup video is not automatically an eligible app preview.