How to return files over output?

In echo, I usually do this:

```
c.Response().Header().Set("Content-Type", "application/pdf")
if err := generatePDFInvoice(c.Request().Context(), params, c.Response().Writer); err != nil {
  return err
}

return nil
```

How do I respond with files in body in Huma? The docs do not have such an example