When inferring Har Path from PageURL Compare is trying to find file browsertime.har.gz whereas SiteSpeed.io is creating browsertime.har
Test with Following
https://dobermanv2.s3-us-west-2.amazonaws.com/sitespeed-result/2020/10/19/xGIVIfF4e-control/pages/www.realtor.com/index.html
Following is the error
Failed to fetch JSON from https://dobermanv2.s3-us-west-2.amazonaws.com/sitespeed-result/2020/10/19/xGIVIfF4e-control/pages/www.realtor.com/data/browsertime.har.gz. Error: Forbidden