Create a dedicated bucket for webGL, because the bucket needs to have special read/access rights. Make sure that the bucket name is in lowercase if you want to deploy it to the CloudFront.

• Go to bucket Permissions > Edit bucket settings and make the bucket public.
  
• Change the Bucket policy, written in JSON, as follows (making sure the Resource has the correct Bucket ARN):

  {
      "Version": "2012-10-17",
      "Statement": [
          {
              "Sid": "AllowPublicRead",
              "Effect": "Allow",
              "Principal": {
                  "AWS": "*"
              },
              "Action": "s3:GetObject",
              "Resource": "YOUR_Bucket_ARN/*"
          }
      ]
  }
  

  Any data in this bucket will be public. If the App folder was loaded together with the Scene, using the URL visible when navigating to the App/index.html file should work: