So per https://github.com/drakkan/sftpgo/blob/d4ea6adcc30bf095d3f4bd8084ddad95991086f5/internal/dataprovider/dataprovider.go#L410 , you should set to users_base_dir to say /app/data/user_files . Then, a user logging in would save things in /app/data/user_files/<username> .
cc @girish , maybe we set something by default