S3 and gzip – what creates the files?

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I have a high volume site that uses AWS Beanstalk and S3 so it’s hard to need around for too long in production with a broken site.

I’m looking to understand what process/action generates the .gzip versions of /wp-include files that are on S3? When we make a change to the Browser settings in W3TC to enable gzip, the HTML references are looking for the .gzip version of files (eg .js) but those files aren’t [yet] on S3.

Does the W3TC CDN push to S3 generate the new .gzip versions or is there some other process?

Thanks in advance