title: lambda deployed through serverless with plugin serverless-plugin-existing-s3 doesn't trigger on S3 upload event
body: <p>I am deploying serverless lambda environment and using serverless-plugin-existing-s3 plugin, all is fine but S3 event don't trigger lambda when i upload files. </p>
  
  <p>Example of code :</p>
  
  <pre><code>service: test-storage
  package:
    individually: true
  
  plugins:
    - serverless-plugin-existing-s3
    - serverless-plugin-include-dependencies
  
  provider:
    name: aws
    runtime: nodejs8.10
    iamRoleStatements:
      - Effect: "Allow"
          Action:
            - "s3:PutBucketNotification"
          Resource:
            Fn::Join:
              - ""
              - - "arn:aws:s3:::TESTBUCKET"
  
  functions:
    onPimImportTrigger:
      handler: testFunc/testFunc.handler
      name: testFunc
      description: Detect file(s) uploaded to Bucket-S3, and handle lambda
      events:
        - existingS3:
            bucket: S3_BUCKET_NAME
            events:
              - s3:ObjectCreated:*
            rules:
              - prefix: TEST/IN
              - suffix: .txt
  </code></pre>
  
  <p>I don't understand, i followed <a href="https://www.npmjs.com/package/serverless-plugin-existing-s3" rel="nofollow noreferrer">package documentation</a>.
  Thanks for help.</p>