Jackie, when you want to make a comment or a reply, in addition to text, you have option to Add photo/Files. So go ahead and click on that box and you will see an area that says “add your photos here”.
If you click there, you can select your photo from your files, or even take one. *You will get a notice if image will not fit. Otherwise it should download.
I’m texting while husband is driving. I hope this makes sense! Let me know if you need more help.