Go to "Technical -> Storage backend -> Storage backend" and create a new backend of type "Amazon S3".


Example of configuration via env
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::

  [storage_backend.name_of_your_backend]
  backend_type=amazon_s3
  served_by=external
  base_url=https://your.cdn.domain.com
  directory_path=foo  # if you want to store in this folder
  url_include_directory_path=1  # if you want to include the above folder in the URL
  aws_bucket=your-bucket-name
  aws_file_acl=public-read
  aws_access_key_id=$SECRET
  aws_secret_access_key=$MORESECRET
  aws_region=eu-central-1