Previously, we created a synchronous Lambda function that takes the string as input and returns the string as output. Now, we are going to create an asynchronous Lambda function that can be invoked through S3 events, and test the function with a dummy event that can upload a file to S3 and see if the function is triggered by the create-object event.

Open the project that we have created. Let's add a new Lambda function handler to the project. Click on the little orange box and select New AWS Lambda Function. We will create a new function handler name, S3FunctionHandler; use the default input type that is already selected, S3 Event; and as leave the output type as object:

Click on Finish. This will create some boilerplate code with the Lambda function handler that takes an S3 event as input:

Let's deploy the new function. Right click...