Do Remote Assets (ie. S3) have file paths?
This question is really more about S3 than about Craft. What you need for the assets is not the file path, but the url. And yes, S3 assets do have a url. This page describes the format for the host:

&lt;bucket-name&gt;.s3-website-&lt;AWS-region&gt;.amazonaws.com


They give these examples:


  This URL requests the photo.jpg object, which is stored at the root level in the bucket.


http://examplebucket.s3-website-us-east-1.amazonaws.com/photo.jpg



  This URL requests the docs/doc1.html object in your bucket.


http://examplebucket.s3-website-us-east-1.amazonaws.com/docs/doc1.html