I regularly post message to this contact and she replies; although her response arrives as a separate text. She often shares images and if I share an image in response she gets it. However... If I post a message to her, using the contact information I always use, she gets, unless.... I include an image. When I include an image I get "no valid recipients for the MM". How is this possible, when I text her all the time using the only contact information displayed on the contacts list?