OICS Import/Register a Library REST API not working

Summary

Documentation notes seem wrong, can't get this operation to work

Content

Using the link:

https://docs.oracle.com/en/cloud/paas/integration-cloud-service/icsrb/op-v2-libraries-archive-post.html

I cannot get this working - it seems to be syntax related but whatever I try I either get a 400 (Bad Request) or 500 (Internal Server Error) - with no clue as to what is wrong.

It makes no difference whether I use something like Postman or from within a task in Azure Devops (I've used both for various other operations e.g. Integration, Connectors, Lookups)

For example, using this

curl -X POST https