When I tried to import the JSON file for WC1 Pilot environment into my Postman it resulted in an error and nothing gets imported. Below are the screen shots for your reference. Please let me know your suggestions. Thanks.
First JSON file has been imported successfully into the Postman client. But the second file (highlighted in the screenshot) resulted in an error given in the second screen shot.
In your given screenshot I saw one pilot environment already exists in your postman collection.So no need to import again pilot environment.Can you please again try to import only postman_collection.json file means first file and let me know if you face the same issue or not.Please after importing the first file, attach the screenshot also.