`vendor.add` doesn't expose dependencies to dev_appserver.py

Migrating a legacy project from 2.7 and Ubuntu 18.04 [piecemeal, Python 3.10 & 22.04 next!] from vendored dependencies to requirements.txt. Removed dependencies from project root and enumerated them in my requirements.txt.

My requirements.txt contains google-cloud-storage==1.44.0 and was venv-2-7/bin/python -m pip install -t lib -r requirements.txt with a appengine_config.py in same dir as app.yaml with:

# From https://cloud.google.com/appengine/docs/legacy/standard/python/tools/using-libraries-python-27
import os

from google.appengine.ext import vendor

vendor.add('lib')
vendor.add(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'lib'))

How do I resolve this error? - Attempted venv-2-7/bin/python -c 'import google.cloud.storage' which worked, but:

$ venv-2-7/bin/python /google-cloud-sdk/platform/google_appengine/dev_appserver.py --host 127.0.0.1 .

Errors [from PyCharm & manually] with:

ImportError: No module named google.cloud.storage

from `vendor.add` doesn't expose dependencies to dev_appserver.py