Managable zones - image
Add attribute to img html node ' data-ecms-tag="image|ID|Storage" ' to manage this node as image. Please look at manageable zones - text for more information about attribute content.
Please add to page <img data-ecms-tag="image|Logo|General" src="/content/images/Logo.jpg" alt="Logo" /> to start managing logo of your site. In this case all data will be written to storage with name 'General' with ID='Logo'.