New bases on Airtable don't show up automatically in miniExtensions unless you have authorized access to all current and future bases in your Airtable workspace during integration with miniExtensions. However, you can still add a base manually by following these steps:
You need to go to Airtable and click on the Profile icon at the top right of the screen.
Click on Integrations
A modal will appear. Go to the Third-party integrations tab and click on the miniExtensions integration.
At the bottom of the modal, click on Add a base. Select the base you want to add then click on Save changes.
You can go now to the miniExtensions dashboard and the base should be already added in the workspace.