Unable to create NWC eXtension for AWS S3 API

Dear all,

I am new to AWS. I am trying to connect to AWS S3 API using Nintex Xtensions.

I have tried the following and require your help.

1. Tried to connect to Aws S3 via API.
   1. Made a successful attempt using Postman
   2. Could not continue further as AWS requires “AWS Signature” which doesn’t seem to be possible with NWC
2. As I am not an AWS expert I did some research and understood that if I create a Proxy using API Gateway then I can connect to AWS without “AWS Signature”. So, 
   1. Created a proxy for S3 API in S3 Gateway
   2. Made a successful attempt using Postman
   3. Downloaded the Swagger file that AWS provided and uploaded to NWC as extension & created required connections
   4. When calling the method from NWC I get an error, as attached. I have tried all variants of Swagger and nothing seem to work and the error message is quite vague.

Has anyone connected to AWS S3 before? Is this is supported?

I am attaching the two swagger files that I used (one with AWS and another with AWS API Gateway)