unable to copy or transfer app from 6s to X
Recently tried to set up new XS using iTunes app. Backup from 6s apparently succeeded but iTunes app refused to recognise XS. Tried the WiFi setup method and that succeeded except for one app. App icon transferred and, presumably, data but app doesn’t work. There is a cloud type indicator before the app name. Tapping on the app icon responds with “No longer available in App Store”. Shouldn’t the transfer have included the complete app? App continues to work on 6s. App included paid upgrade to full features. Only means of using it now is to keep the 6s running for the sake of that one app. No alternative apps available.
iPhone XS, iOS 13