Online store extension

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I want to develop an app which will directly interact with the end users.

This will app will be inside online store.

I went through the documentation and found that it can be done with the help of Extensions for online store.

After creating Extension -> Online store -> Theme App Extensions I am getting a message of "Push code to preview this extension"

Is there a way in which I can preview my app without uploading the code?

Is there any tutorial which I can follow to create an extension?