Getting a 404 when deploying to Vercel

I get a 404 when deploying to Vercel. But was advised along the way to delete index.tsx I guess it has something to do with:

So in /pages I only have :


What do I do?

OK I think I see now. @icaro wanted me to put my project on Vercel so he can help with an issue.
I followed this and configured my project to point to:

But still see a 404.

I don’t understand the term Header or Payload? The docs seem to indicate that it’s optional:

So I need to run the build script before deploying to Vercel?

Fix with help from @icaro