S7 Edge pictures not working with iPhone

I recently got an S7 Edge and my husband has an iPhone 6 Plus. Every time I send him pictures through a multimedia text message, they won't show up on his phone. Part of the picture is there and the rest of the picture is grayed out. Has anyone else had this issue? Or know how to fix it? Thanks!

Hi, are you sending the image through the stock messaging app? What happens if you use an app like WhatsApp, does the issue continue?