WP_Image_Editor problem ?

Are you setting the plugin to remove local copies of the images?

Ok so the problem here is that WP_Image_Editor requires the file to be present on the server. We have encountered this with the Regenerate Thumbnails plugin and have built support for it in the next version. https://github.com/deliciousbrains/wp-amazon-s3-and-cloudfront/pull/170

In that change we have hooked into the filter ‘get_attached_file’ to copy the file back to the server so it can be used and then cleaned up after. Other plugins and themes can utilise this like we have for regenerate thumbnails (https://github.com/deliciousbrains/wp-amazon-s3-and-cloudfront/commit/a7650ac6c12b67318fcd1a3fb41b6ae3f875ba4f)

If we get enough requests for a certain plugin/theme compatibility we may add in support to the plugin, but in the short term this functionality can be added in a separate plugin or in the Themify theme itself.