Why can I not download pictures over mobile data?

[Android Central Question]

When I receive a text with an attachment, like a picture, the ONLY way I can download it and see it is if I'm connected to wifi. It will never download otherwise. Everything online has the opposite problem.

I'm on a Galaxy S7

 

[B. Diddy]

Welcome to Android Central! Who's your carrier? Are you certain your mobile data is on and reception is good? Are your APN settings correct for your carrier?