Mobile app pages are pages that you add after the Initial page, you could add one or multiple pages based suit your needs (1).
Mobile app page information will be used by your Field user when they worked on the Task, information on this page could be linked to the information on the Initial Page, or it could be independent information such as singular / multiple selections, photos, signature, etc.
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Make sure to navigate through the mobile app preview while building a flow, this might give you an idea of how the flow would look and behave in the mobile app.
