// Ensure the accumulator knows how to apply an FMyStruct (usually this will be on a property, and happen through EnsureActuator<>) FMovieSceneBlendingActuatorID ActuatorTypeID = FMyActuatorType::GetActuatorTypeID(); if (!ExecutionTokens.GetAccumulator().FindActuator(ActuatorTypeID)) { ExecutionTokens.GetAccumulator().DefineActuator(ActuatorTypeID, MakeShared()); }