Enable AWS Lambda Function Extension Support

Go to Settings > Extensions and click the INSTALL button on the AWS Lambda Function Extension. A Drawer similar to the picture below will pop up.

You will need an Access Key ID and Secret access key in-order to enable this Extension. Please refer to this doc to create a new key if you do not have any. Now click Save button below to Enable the Extension. It will how a Success Message if properly enabled, and your aws key is valid otherwise you will get an error message.