How you add an image to a comment isn’t exactly what I’d call easy but it is straightforward. One of my students noted that a tip in Microsoft Office Excel 2007 Bible didn’t provide the magic to insert an image.
I’d have to say that it did but it didn’t. Basically, the general idea is there but a step of magic requires something special. You need to place your cursor on the highlighted edge of an editable comment before right clicking to launch the context menu. If your cursor is on the text portion of the comment, the context menu operates differently. The Format Comment … menu choice launches a different set of options dependent on your location in an editable comment.
Hoping to help my students and others learn the magic, here are some steps.