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Can you send MMS with the stock app?
If you're on Sprint, I know that the stock apps usually switch off WiFi and send the MMS through 3G or 4G, then switch WiFi back on.
Perhaps the 3rd party apps don't do this?
I had lots of issues sending mms also. Then realized for whatever reason that mobile data wss not enabled. Go to settings/connections/more networks/mobile networks/ and make sure "mobile data" has a check in it.
Don't know why this was not enabled to begin with but it solved all my issues.