If I create a new API from boilerplate, it creates it with
"openapi": "3.1.0",
and looks fine. But when I change my version in my existing API index.json from 3.0.3 to 3.1.0, I get an “Unable to validate the definition” error.
But I also notice that the newly created definition from 3.1.0 does not have an ability to create files or folders (I am using those currently for schemas). These are possibly related.
Welcome to the Postman Community! 
OAS 3.1 in Postman does not have support for multi-file yet and you won’t be able to create files/folders.
Regarding the "Unable to validate the definition" error - Could you provide screenshots (Full app images) of what you are seeing, please? It will make it easier to try and tell you what could be happening.
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