Node Red on AWS Lambda(Serverless deployment)

[touhid6991]

With respect to node-red deployment on AWS lambda using amazon API gateway and S3. I have created flows and deployed them. Once after deploying the flows, flows gets updated to S3 buckets and I'm able to access the HTTP request through API Gateway

I had referred GitHub - sakazuki/aws-serverless-node-red: Node-RED on AWS Lambda using Amazon API Gateway and S3 1

But main concern is:
How flows getting updated in the S3 bucket[flow.json file] (what's the process behind it) once we deploy flows locally?
How you are customizing/configuring in order to save the flows in an S3 bucket

Can you please help me out with this?
Please find screenshots for reference below