Including external images in epub

[Marcus Schiesser]

Hi, 

i am hosting pressbooks via a cloud service, so i store the images not in the wordpress media library. Unfortunately, when I generate a

epub, the images are not copied as assets. This might also be a problem if someone is using a CDN for caching reasons.

In my opinion there should be an option for copying external images too. What do you think?

Best,

Marcus

[bdolor]

Hi Marcus,

It is not a requirement that images be placed in the media library for them to make it through the epub export routine. I'd start with confirming that `wp_remote_get()` is returning a wp_error which would cause `fetchAndSaveUniqueImage()` to return an empty string - https://github.com/pressbooks/pressbooks/blob/dev/includes/modules/export/epub/class-pb-epub201.php#L1622 

If that's the case, then I'd look at what HTTP transports (i.e. curl, streams) your hosting server supports: https://codex.wordpress.org/HTTP_API 

Brad.