Actually for me is working and I even don't use sys.path.append but I use full path in from

from refined_pipeline_library.refined_pipeline.data_utils.data_utils import normalize_string

than in folder data_utils I would put file data_utils.py with class normalize_string,

additionally I always put __init__.py empty file,

and of course "files in repos" need to be enabled in admin console 🙂