Broken images

I checked with the cloudfront URL in the WordPress plugin and that works. It seems to be it’s not seeing CNAME I’ve set up

Did you ever manage to fix this?

I am having the same issue here ??

It happens because of wrong region name and if you correct region name, it doesn’t include bucketname.

Do this if you can edit core files:
amazon-s3-and-cloudfront.php in Classes

Comment out these lines:

function sanitize_custom_domain( $domain ) {
		//$domain = preg_replace( '@^[a-zA-Z]*:\/\/@', '', $domain );
		//$domain = preg_replace( '@[^a-zA-Z0-9\.\-]@', '', $domain );

		return $domain;
	}

470 and 471 in “sanitize_custom_domain” function

Then go to your wordpress backend and set custom domain:
s3-us-west-2.amazonaws.com/BUCKET_NAME

Jquery validation won’t let you save it.
So you will have to enable the save button.
You can do it by inspect element.