If you're trying to add a new page to super but you get an error that the page is already added, this means that super has already found and added the page to your site. But where is it? Super will add the page where it first finds it. Let's find where that is.
1. Take the last part of the Notion URL:https://a-notion-user.notion.site/Some-Page-On-The-Site-a4af4c1bc1bb47a3829a6d6eae7787c9
1. And add it to your custom domain https://your-super-site.com/a4af4c1bc1bb47a3829a6d6eae7787c9
If Super has already added it to your site, then it will rewrite the URL as https://your-super-site.com/content/some-page-on-the-site or whatever it is.
If Super does not change the URL, then another page is using that title/path at that location.
