Issue with previewing slug routes in Sanity Studio-embedded previews.

Hi Sanity folks,First, thanks for getting the guide at
https://www.sanity.io/guides/nextjs-live-preview back up. It’s helped me get Studio-embedded previews working. However, when I add the code in Next Steps to my Iframe options object, I can’t preview my slug routes, only my homepage. I checked that the slug is available and the path correct. For instance, if I try to hit my about page, the url displayed in the studio’s Iframe form has http://localhost:3000 carved off and displays only

/api/preview?slug=/about

When I enable preview mode outside of the studio and navigate to those routes, it works fine. Looking through
the repo linked in the guide, I can’t see anything I’m missing. Should the

true

condition resolve for valid slugs here? What am I missing?

Also, the key

URL:

seems not to work at all, and I only get the preview to resolve if I use the lowercase

url:

You’ll need to update your preview route to:
1. Retrieve the value of the

slug

parameter, if supplied2. Perform a client.fetch for a document with that

slug

3. If found, redirect to the found document’s slug, not the home page

Thanks, . That’s what I was missing. I think this was a case of “read one map and get there, read 5 maps and get lost.”

That’s a new one to me 😄

did you fix this? could you please provide a code example?