Post to API returns response on Chrome App but not Native app

We are posting an XML file to an API which produces a response but are currently getting different outcomes between the Chrome App and the Native Mac App.

With smaller files both versions post and get a response correctly however when the file is larger and the response takes more time >5 min the response is never returned on the native app. It continues to show “loading” continuously. We checked the server side and the response does get generated and when testing via the Chrome app version we are getting the response back.

Any ideas what could be causing the difference? All the headers and parameters appear to be the same and no timeout is set on either version.

Any messages on the console? Either DevTools or using console.log?