Attach files, links, images, and knowledge articles to messages In addition to entering text, you can attach files, such as images, documents, and spreadsheet files in any ServiceNow supported file type to live feed messages. Administrators can manage attachment file settings, such as supported file types and maximum attachment file size, by editing system properties . You can also include links to user-defined URLs and knowledge articles contained in your instance's knowledge base. Note: The functionality described here applies to HTML5-compliant browsers, such as Chrome, Firefox, Safari and Internet Explorer 10 and above. Significant differences while using different browsers are highlighted.