docs: Add sample command with optional parameters to README

Author: roblOnTour

lambda-s3-download/README.md

@@ -54,7 +54,7 @@ The function is configured with a 15-minute timeout, 1 GB memory, and 10 GB ephe
 
 ## Testing
 
-Invoke the Lambda function with a test event:
+Retrieve the Lambda function's name from the SAM deployment output and invoke it with a test event:
 
 ```bash
 aws lambda invoke \
@@ -75,6 +75,22 @@ Optional event parameters:
 | `target_bucket_region` | S3 bucket region | Lambda's region |
 | `chunk_size_mb` | Size of each download chunk in MB (clamped between 5 and 5120) | 512 |
 
+Example with all optional parameters:
+
+```bash
+aws lambda invoke \
+  --function-name FUNCTION_NAME \
+  --cli-binary-format raw-in-base64-out \
+  --payload '{
+    "download_url": "https://example.com/file.zip",
+    "download_filename": "file.zip",
+    "target_bucket": "my-other-bucket",
+    "target_bucket_region": "eu-central-1",
+    "chunk_size_mb": 256
+  }' \
+  response.json
+```
+
 ## Known Limitations
 
 - The Lambda function has a 15-minute maximum timeout. If the download and upload combined take longer than that, the function will be killed mid-stream and the multipart upload will be left incomplete. Consider setting an [S3 lifecycle rule](https://docs.aws.amazon.com/AmazonS3/latest/userguide/mpu-abort-incomplete-mpu-lifecycle-config.html) on the target bucket to auto-clean incomplete multipart uploads.
@@ -85,12 +101,8 @@ Optional event parameters:
 ## Cleanup
 
 1. Delete the stack
-    ```bash
-    aws cloudformation delete-stack --stack-name STACK_NAME
     ```
-1. Confirm the stack has been deleted
-    ```bash
-    aws cloudformation list-stacks --query "StackSummaries[?contains(StackName,'STACK_NAME')].StackStatus"
+    sam delete
     ```
 ----
 Copyright 2026 Amazon.com, Inc. or its affiliates. All Rights Reserved.

lambda-s3-download/example-pattern.json

@@ -45,13 +45,13 @@
   },
   "cleanup": {
     "text": [
-      "Delete the stack: <code>aws cloudformation delete-stack --stack-name STACK_NAME</code>."
+      "Delete the stack: <code>sam delete</code>."
     ]
   },
   "authors": [
     {
       "name": "Robert Meyer",
-      "image": "https://serverlessland.com/assets/images/resources/contributors/ext-robert-meyer.jpg",
+      "image": "",
       "bio": "Robert is a Partner Solutions Architect with AWS in EMEA.",
       "linkedin": "https://www.linkedin.com/in/robert-meyer-phd-6a114a58/",
       "twitter": "@robl_on_tour"

lambda-s3-download/template.yaml

@@ -12,7 +12,7 @@ Resources:
     Type: AWS::Serverless::Function
     Properties:
       Handler: app.lambda_handler
-      Runtime: python3.12
+      Runtime: python3.14
       CodeUri: src/
       Timeout: 900
       MemorySize: 1024
@@ -26,6 +26,9 @@ Resources:
             BucketName: !Ref TargetBucketName
 
 Outputs:
+  DownloadFunctionName:
+    Description: Serverless Downloader Lambda Function Name
+    Value: !GetAtt DownloadFunction.Name
   DownloadFunctionArn:
     Description: Serverless Downloader Lambda function ARN
     Value: !GetAtt DownloadFunction.Arn