Galaxy s5 problems with texting photos from Gallery

[AC Question]

I have a Galaxy s5. When I text a photo from my Gallery, it opens w/the correct photo, but also with a thumbnail on the bottom of the picture. If the photo is turned, half of is covered up by the thumbnails. Help! I'm new on the galaxy. I have sent a couple other photos before, but didn't hear back of any problems with them.
Thank you