Just use the default android file manager, it does just fine
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It may. But one of the reasons I recommend Solid Explorer is in the case someone wants to backup (or install someone else’s) savefiles
Since Android 11 - if my memory doesn’t fail me - they added restrictions to the apps private folders.
To get to the savefiles on Android you need to go to:
Android/data/com.domain.corruptedkingdoms/files/saves
Some file managers can’t access that folder. Solid Explorer is not the only one, but the one I use.