I created an e-commerce app in outsystems. now i need to make the app available for public, i know i can do that by submiting my app in playstore but, my data are now in outsystems server. how can i achieve this?

You can review this article on how to publish your app to the app store(s).

As for the data being on OutSystems, your app will connect to the environment the app was built on in the background and store/read the data from there.