Is it possible to send MMS from Journey Builder. If yes, how can it be done since Journey Builder only allows one to create SMSs.
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Unfortunately it is not possible to send MMS messages through Journey Builder without creating a custom activity for it. There is no (and probably will not be any) OOB functionality for it.
The reason why there is barely any support for MMS-related options is because Marketing Cloud only supports sending MMS messages in the US.
There is an open Idea that you can vote on though.