Flask custom module import working locally fine, errors with app platform

I have a flask app with the following structure

orthocms
-orthocms.py
-helper.py
orthocms/app
--__init__.py
--forms.py
--models.py

I define helper as the following to use globally without the need for importing it into every page

orthocms.py

from app import app
import helper

@app.context_processor
def inject_user():
    return dict(helper=helper)

When I test the app locally, I can safely use helper.* functions in templates, however, after deploying with app platform I get the following error

{{ helper.format_date(p.birth_date) }}
jinja2.exceptions.UndefinedError: 'helper' is undefined