@MKS_AWS There are a few ways to break up JSON within a flowfile (splitJson,QueryRecord). However if its just one giant blob of JSON you may not find that very useful. Perhaps you can share some sample json to that effect.
Check out this way to do SNS up to 2gb per payload:
https://github.com/awslabs/amazon-sns-java-extended-client-lib
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Thanks,
Steven