Are you on one of the older koodo plans? If so double check to see if your plan includes picture messaging, if it does then double check you apn settings to make sure it allows mms. Another thing so check for is whether or not you have data block on your account. does your data work?
My Koodo plan was one of the older ones but I just changed it and it still isn't working. My plan says 'Unlimited SMS and MMS messaging'.
My APN settings you can see in image below. I have data turned off on roaming, but otherwise yes data works. Thanks for trying to help!