Saving HttpRequestResponse to file

I noticed that there's a method called saveBuffersToTempFiles() that says that it allows saving of HttpRequestResponse objects to a file. Is there anymore information on how to use this? I haven't been able to successfully use it. Is there an alternative way to save the state of extensions using this method or a less hacky way without using addToSiteMap()? https://portswigger.net/burp/extender/api/burp/IBurpExtenderCallbacks.html#saveBuffersToTempFiles(burp.IHttpRequestResponse)