Remove Icon-I need help to allow a user to remove single instance of image imported by ImportIcon button. The icon IS the image. I want the user to be able to clear or remove single image. The icon ISN'T showing as Field-see dialogue boxes. Why not?

George provided the correct information. If you need a bit more information about how to do that, this recent discussion may provide that: JavaScript for Clearing JPEGs out of a Form??? (Adobe Acrobat Pro DC)

You'll have to use JavaScript, so you're in the right place. See this previous discussion for more information: How to remove an icon in a button

When you reset a form field, it sets the field value to the default value. Since a button does not have a value, a button field isn't a type that can be reset with a "Reset a form" action or the resetForm JavaScript method.