After you have set up the Notion integration, you can use Notion pages to answer questions in Tettra or mention them in Tettra pages.
To answer a question with a notion page, click in the comment box and then click on Attach. Choose Page or link.
Then search for and select the appropriate Notion page.
Within a Tettra page, type # (shift + 3) and then begin typing the name of the Notion page you want to reference. Tettra will search within Notion and present related pages so you can select the one you want.