Got server bundles but can't see next step for a Vercel deployment

[stevejpurves]

Hi Folks!

I have started using the Server Bundles feature (docs here) and I am happily producing two bundles "api" and "server" (my remix app provides a small API alongside the the main app), and I have the route manifest output available as described in the docs.

Everything works happily locally after the server bundle change, but doesn't deploy out of the box on Vercel (Vercel build halts with an error (Error: can't read regions on undefined, or similar)).

So, I was expecting that, as the docs do say that the manifest has the info needed to map routes to my new server bundles but how do we do that in the context of Vercel?

It seems like this would be down to manual configuration of-the/during Vercel build process? but I can't find any docs on where to get started with that...
Also it doesn't seem like there is an additional step on the remix configuration side to do here?

Has anyone already done this and/or can give some pointers?