@kishoreindraganti - the payload limit in Runtime is 1MB, more details
at:
https://www.adobe.io/apis/experienceplatform/runtime/docs.html#!adobedocs/adobeio-runtime/master/guides/system_settings.md.To
deliver larger payload you can leverage a cloud storage, for example
upload your files to S3 and return a redirect response from your action
to the file URL.