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Your save file from Epic Games is located here:
C:\Users\YOUR PC NAME\AppData\Local\Saber\WWZ\client\storage\slots
In the folder you're looking for the file: user_progression.dat

Open the Steam Cloud directory for WWZ:
C:\Program Files (x86)\Steam\userdata\your steam user ID\699130\remote
Delete the user_progression file located in the steam folder and replace with the Epic Games user_progression.dat. Rename the file from .dat to .cfg.