API Schema validation

I am attempting to upload an API schema to use with API Shield, but I am getting an error:

 {
  "code": 21400,
  "message": "array parameter type is only supported when both explode=true and style=form (.paths[\"/answers/{ids}\"].get.parameters[0])"
}

If I try providing explode and style I get:

 {
  "code": 21400,
  "message": "only default parameter styles are supported: path, form (.paths[\"/answers/{ids}\"].get.parameters[0])"
}

The portion of the schema it’s complaining about looks like:

                "parameters": [
                {
                    "name": "ids",
                    "schema":
                    {
                        "type": "array",
                        "items":
                        {
                            "type": "integer"
                        }
                    },
                    "required": true,
                    "description": "comma-separated list of Answer ids",
                    "in": "path"
                },

which validates without errors in https://editor.swagger.io/
The path parameters I need to support look like:
/answers/1,2,3

How do I properly support this?