how do you make picture sending work for Nokia phone 6085 ? ?

when i first got the Nokia buzz 6085 the picture sending worked perfectly but i don’t know what happened after that .
The instruction manual does not help .
Every time i try to send a picture thought a minute later it tells me that the sending has failed check details.
i don’t know i tried to tell the at&t network but they don’t know either .
i Really don’t want to get another buzz so help with the one i have now please .

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