Check if CDN uploads are successful
Check if CDN uploads are successful

Knox doesn't error if the request is not successful, so we need to
check the status code ourselves

Ultimately we may want to move to a maintained library but, with
this check, debugging should be less of a problem in future

bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js