Here is an example of a video posting. It is just as easy as uploading a still image, but takes a little longer to upload.
......Ron
This blog was established for Club Mac of Monterey (CMoM) members to communicate amongst themselves regarding all things Mac. Club Mac of Monterey is a authorized Apple Macintosh user group and meets monthly at 7:00 PM on the second Friday of each month in the Canterbury Woods Auditorium, 651 Sinex Avenue in Pacific Grove, CA.
Evidently you cannot upload an image in a comment. However, it is easy to upload an image when creating a new post. Unlike the comment window, the new post window has a menu that allows you to format text, as well as uploading images and movies. You must be signed-in to create an new post. It only took me a few seconds to upload the image to the right.