Changes are not reflecting with python flask API when deployed to Azure APP service. Issue with reloading the gunicorn web server

I have developed a API using python flask. When any code changes and run it locally, API reflect the new changes but in the case where I am deploying it to Azure App service, any new changes are not reflected. API shows the old functionality on Azure App Service.

I have created a startup.txt and included below command:
gunicorn --bind=0.0.0.0 --workers=4 --reload-engine=auto main:app

I read articles where they say you have to restart or reload the gunicorn web server which is the default with flask app. But no luck.
https://docs.gunicorn.org/en/latest/settings.html#reload

Please let me know.