title: AppEngine App Deploy gives "Failed to copy file."
body: <p>I'm deploying a Laravel app to a fresh App Engine project. But I'm getting this error constantly. I tried creating a new project and deploying too.</p>
  
  <pre><code>╔════════════════════════════════════════════════════════════╗
  ╠═ Uploading 9625 files to Google Cloud Storage             ═╣
  ╚════════════════════════════════════════════════════════════╝
  File upload done.
  Updating service [default]...failed.                                                                                                                                    
  ERROR: (gcloud.app.deploy) Error Response: [3] Errors were encountered while copying files to App Engine.
  
  Details: [
    [
      {
        "@type": "type.googleapis.com/google.rpc.ResourceInfo",
        "description": "Failed to copy file.",
        "resourceName": "https://storage.googleapis.com/staging.rsvp.appspot.com/df4bc71e8832337e997291648609c4e207b5aa55",
        "resourceType": "file"
      }
    ]
  ]
  </code></pre>
  
  <p>WHat is the problem here and how can I fix it?</p>