title: Trigger a Lambda function from multiple S3 file uploads
body: <p>I am new to some AWS services.</p>
  <p>Our source team uploads 2 files in a S3 bucket at some interval. They run one pipeline and upload a file in S3. Then they run another process and upload another file in S3. Both their processes run in parallel so files are not uploaded in a specific order.</p>
  <p>we need to trigger our Lambda function when both files are uploaded in S3.
  We tried to trigger lambda from S3 events and SNS but it trigger lambda twice because of 2 S3 events.</p>
  <p>What is the best approach to handle this? Any suggestion would be appreciated.</p>