F5 AWAF/ASM Fails to update OpenAPI file through REST-API

I use this paylod for the POST request to /mgmt/tm/asm/tasks/import-open-api

$swagger_file is the previous uploaded swagger file

$waf_policy is /mgmt/tm/asm/policies/<policy hash>

{
    apiType: "swagger",
    filename: $swagger_file,
    policyReference: {
        link: $waf_policy
    }
}