So I recently bought a new phone and there's this app I have on my old device that is not available in the play store anymore and that I should nonetheless like to move to my new device.
I'm confident that if I searched for it on the net, I'd be able to find the .apk of the app.
However, I also know that after installation, the app used to connect to a server to download additional files necessary for the app to work (once). That server doesn't exist, anymore. The data, though, must of course still be on my old device, somewhere.
Where do I find that data and how can I move the app?
Note: neither device is rooted.
Note: I cannot root the new device