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Power Automate Large File Error with On Premise Gateway

I have designed a Flow that communicates to On Premise REST API developed in .NET via On Premise Gateway. It sends Base64String of a document from SharePoint and expects modified Base64String which then is updated to some other external system via API. 


This is working fine with smaller files, but I have a large file around 17 MB. When I am sending this to Custom Connector connected using gateway, I am getting following error.... 


Gateway on endpoint '<ii>sb://</ii>' is unreachable.


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