Joomla Editor Button Zero App

Hello, I am adding galleries from a different gallery extension using shortcode into Zero App. The button for the gallery is missing in the editor. I assume you are blocking it since it appears everywhere else in Joomla in the editor. How can I get this turned on? It's very cumbersome to go to a different place to create this shortcode and then open the Zero App editor to insert it. I want to be able to insert it directly into the page.

Thank you

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