HTML attribute override options for images added by reference
For images added by reference, you cannot override the default HTML attributes from within a communication. To change the HTML formatting for referenced images, change the attributes that are defined in the UAEreferenceLabel tag.
To edit the UAEreferenceLabel tag, you must edit the communication template. Make a local copy of the template to avoid affecting other communications that are based on the same template.
If the reference tag contains non-English characters, you must define HTML attributes in the source code with a text editor. Do not use the embedded editor.