Quests&Objectives
Solo Multiplayer
BP C++

Save

void AMyPlayerState::OnQuestSaveDirty()
{
    if (!QuestComp->GetOwner()->HasAuthority())
    {
        return;
    }
    const FQuestSaveData Data = QuestComp->GetSaveData();
    // Write Data into your USaveGame
}

void AMyGameMode::HandlePlayerLoaded(APlayerState* PS, const FQuestSaveData& Data)
{
    if (UQuestComponent* QC = PS->FindComponentByClass<UQuestComponent>())
    {
        QC->LoadSaveData(Data);
    }
}

LoadSaveData on a non-authority machine is ignored.

Optional Blueprint equivalent. Bind Event to On Quest Save Dirty only on authority.

Build the tracker and log on the HUD page for this mix.

The sample project stores FQuestSaveData in UQESaveGame. That class is sample code. It is not part of the plugin.