chore: add gen2 access type link for group access

Author: HuiSF

src/pages/gen1/[platform]/build-a-backend/storage/download/index.mdx

@@ -369,5 +369,7 @@ Users can run into unexpected issues, so we are giving you advance notice in doc
 - [Image compression](https://github.com/aws-amplify/amplify-js/issues/6081) or CloudFront CDN caching for your S3 buckets is not yet possible.
 - There is currently [no API for getting the identityId of other users](https://github.com/aws-amplify/amplify-js/issues/5177); you have to retrieve this from elsewhere before calling `downloadData`.
 - `downloadData` does not provide a cache control option and it replies on runtime HTTP caching behavior. If you need to bypass the cache, you can use the `getUrl` API to create a presigned URL for downloading the file.
+- `downloadData` does not support S3 object versioning, it always downloads the latest version.
+- There is no API for [Cognito Group-based access to files](https://github.com/aws-amplify/amplify-js/issues/3388). You may use [Amplify Gen2 Storage](/[platform]/build-a-backend/storage/authorization/#access-types) to achieve this. 
 
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