Steps:
(on Public API)
1 - Create new ContentCreateStruct of content type "article"
2 - fill data:
    - Name: Test article
    - Intro:                 
          '<?xml version="1.0" encoding="utf-8"?>
           <section xmlns:image="http://ez.no/namespaces/ezpublish3/image/"
                xmlns:xhtml="http://ez.no/namespaces/ezpublish3/xhtml/"
                xmlns:custom="http://ez.no/namespaces/ezpublish3/custom/">
                    <paragraph xmlns:tmp="http://ez.no/namespaces/ezpublish3/temporary/">
                        This a xml text/block
                    </paragraph>
           </section>'
     - Image: (add some image from disk)
3 - Create new draft with this content info

(on eZPublish)
1 - go to "Content structure" -> "Test article"
2 - click on "Manage versions"
3 - click on the draft
4 - verify that the image is not present

(on terminal)
1 - go to <site>/ezpublish_legacy/var/<siteaccess>/storage
2 - verify that the image isn't there