Can't recover worlds

I'm trying to recover my worlds on my Google Pixel 2 (running Android 11). Since there is already a folder in my file manager with what appears to be 2 worlds in it, I renamed that one, and created a new folder named minecraftWorlds. And I get an error message stating that this brand new folder is not empty! How is this possible? How can I fix it? I really miss playing these particular worlds.