You can store files and data using the Amazon S3 service in all types of projects, but managing these files can be difficult if you don't know they have been uploaded. To monitor files that are uploaded to the Amazon S3 service, an AWS Lambda function is created to send an email with metadata such as name and size to notify you what has happened in the repository files. The function uses Twilio SendGrid to send emails and requires a free account to be used. A .NET IDE is needed for development, and the source code can be found on GitHub. To configure SendGrid, a single sender verification is used for testing purposes, but domain authentication is recommended for production environments. An API key is created to send emails with Twilio SendGrid. S3 buckets are configured for file storage, and a Lambda function is created to monitor incoming files in the bucket. The function listens for events on the bucket, receives data relating to the S3 event, and formats it into a string that will be sent via email using SendGrid. The function uses environment variables for source and destination email addresses and the SendGrid API key. The updated function is uploaded to AWS Lambda, and testing is done by uploading new files to the S3 bucket, which triggers the function to send emails with file metadata.