Why is my session variable not working in my Python-built Shopify app?

[sgtlab]

I'm building Shopify App using Python(Flask framework). On post-installation, I create a session variable as below and then redirect to my app main page

session['current_profile_id'] = my_profile_id_value

 From my app, I try to read the value but always got None which means the session variable was somehow not set.

session.get('current_profile_id')

Can I use sessions to share data across my app? 

[Zworthkey]

Hii @sgtlab,
I hope this link is helpful for you. 

Thank You.

[sgtlab]

My app is an embedded app so it is loaded inside an iframe from Shopify admin. It seems that the session cannot be used in Iframe.

There is a report here someone facing the same issue: https://stackoverflow.com/questions/60605801/flask-session-is-not-persisting