I don't do it that way. I'm on an iPad right now, and in the tab above the window for "Quick Reply" the option of adding a photo is in the third icon from the right - it's a tiny picture frame with a picture of a tree. If you click on it, you're given the option of adding a photo from your computer.
I'll do a test picture now just to make sure it works...
View attachment 170355
Yes - it works!