This plugin conflicts with Amazon S3 and Cloudfront plugin

Inserting images from the media library that have been uploaded to Amazon S3 and then removed from the local server results in broken image links, I fixed this issue by patching the file sb_root_relative_urls.php.

Changed This:

static function root_relative_url($url, $html) {

        //If urls already start from root, just return it
        if ($url[0] == "/") return $html;

        $p = parse_url($url);
        $root = $p['scheme'] . "://" . $p['host'];
        $html = str_ireplace($root, '', $html);
        return $html;
    }

To This:

static function root_relative_url($url, $html) {

        //If urls already start from root, just return it
        if ($url[0] == "/") return $html;

		// Don't strip URL data for images stored on external cloud servers such as Amazon S3...
		if ( self::dynamic_absolute_url($url) ) {
			$root = '';
		}
		else{
			$p = parse_url($url);
			$root = $p['scheme'] . "://" . $p['host'];
		}

        $html = str_ireplace($root, '', $html);
        return $html;
    }

Otherwise this is the single best plugin for WP…

Cheers.

https://www.ads-software.com/plugins/root-relative-urls/