I play the Android version
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Just to be sure, you're getting your saves from:
Android/data/com.domain.corruptedkingdoms/saves
Correct?
If you're running Android 11+ then Google has hidden your data folder. To access it you need to connect your phone to your PC with a USB cable or use an app like Solid Explorer or X-Plore to give you access to the folder again.
Also, you don't need to manually transfer saves around, regardless of your device or OS. The game will do it for you :)