Steps to reproduce:

1. Go to PlatformUI;
2. Create and publish an image of content type "image" with an uploaded image from your local drive;
3. Create an article on "eZ Platform" content, and on its richtext field, insert the image content you created previously.
4. Preview the article. Here we can see that the image do not appear. Only it's name.

The result is the the same, either we publish or not the article before previewing it.

Might be related with EZP-25494