Unable to add a snippet using app extensions

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I want to add an app snippet from the partner console for the app using the app extension. I am following the docs but I don't see an option to add a snippet. What am I missing here? Please help. Below are the screenshots of the extensions page. 


Screenshot 2020-10-12 at 12.02.53 PM.png


Below is the docs page to do the same. 

Screenshot 2020-10-12 at 12.03.29 PM.png


Thank you