can't open picture attachment in text message

[kdavidson100]

I just got a Samsung galaxy s5 through at &t. When in group text, someone sent a picture attachment. I get a grey box with yellow triangle and a red exclamation point. In the same thread, I was able to open pics. This same thing happened on my old atrix hd. Some come through but some dont. I'm so frus rated!

 

[B. Diddy]

Have you asked AT&T about it?