My photos are not sending in group messages, but are sending in individual messages?

I'm with Straight Talk Wireless. At first my pictures were sending in the group message but now they are not. I don't know what's wrong, all my settings are what they are suppose to be, and I'm currently on an iPhone 5s IOS 8.4.

The messages should show in a group on your phone but you can also have individual convos with people in your group going at the same time. Also, the people you are texting need to have iphones too to see the message as a group thread rather than as a individual message from you.

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