Fileshare, filetransfer from Ipad air 3 to an Iphone 12
Hi, I recently upgraded my Iphone 8 to a Iphone 12, and did a safety backup in both Icloud and on my Mac, beforehand. After transferring files and apps to my new Iphone I discover the content from one of my apps, is empty only the shell was on the new phone, I did similar exercise from an old Ipad to a new Air... without any issues... The company from where I bought the app, doesnt reply anymore.
So my question is, how can I fileshare the full content af an app, from my Ipad Air to my Iphone 12? Is it possible and how?