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-rw-r--r--guides/source/active_storage_overview.md7
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@@ -114,6 +114,13 @@ gem "aws-sdk-s3", require: false
NOTE: The core features of Active Storage require the following permissions: `s3:ListBucket`, `s3:PutObject`, `s3:GetObject`, and `s3:DeleteObject`. If you have additional upload options configured such as setting ACLs then additional permissions may be required.
+NOTE: If you want to use environment variables, standard SDK configuration files, profiles,
+IAM instance profiles or task roles, you can omit the `access_key_id`, `secret_access_key`,
+and `region` keys in the example above. The Amazon S3 Service supports all of the
+authentication options described in the [AWS SDK documentation]
+(https://docs.aws.amazon.com/sdk-for-ruby/v3/developer-guide/setup-config.html).
+
+
### Microsoft Azure Storage Service
Declare an Azure Storage service in `config/storage.yml`: