idon't use the app but the description says "Cloud save support for playing across all your iOS devices for Rockstar Social Club Members" (see https://itunes.apple.com/us/app/grand-theft-auto-san-andreas/id763692274?mt=8). This implies that saves are stored in the cloud so they can sync across your devices. However, it doesn't say "iCloud" so it may be another cloud service available to their "social club members".