DocSpring OpenAPI Integration

I am trying to set up an OpenAPI integration based on the JSON provided in the link below, but it is giving me an error message "The selected OpenAPI document could not be parsed" when I upload the document. Does anyone have insight here? I am not seeing anything in Appian's documentation that would assist troubleshooting.

https://docspring.com/api-docs/v1/openapi.json

Source: https://docspring.com/docs/api/openapi.html