Google Cloud Storage API Settings gives me Failed to load

Question

I'm trying to use the Google Cloud Storage API from angular uploading some files. I've craeted a browser key on the API & Credentials console menu. But when I perform a GET on the URL https://www.googleapis.com/storage/v1/b/[PROJECT_ID].appspot.com/o?key=[API_KEY], I receive this

{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "accessNotConfigured",
    "message": "Access Not Configured. The API (Cloud Storage API) is not enabled for your project. Please use the Google Developers Console to update your configuration.",
    "extendedHelp": "https://console.developers.google.com"
   }
  ],
  "code": 403,
  "message": "Access Not Configured. The API (Cloud Storage API) is not enabled for your project. Please use the Google Developers Console to update your configuration."
 }
}

When I go to the Google's console to configure that on the Storage > Cloud Storage > Storage settings it gives me this error at the top of the page

Can anybody help me on this goal? It is important to me that the API is consumed from the font-end only, because it is a Apache Cordova app with angular, trying to upload files (Media) to the Cloud.