How to play animation sequence with c++

Development Character & Animation
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1

I have a first person player, I want to play arms animation in c++ code.
My code:

AMyPlayerCharacter::AMyPlayerCharacter()  
{

    ...

	static ConstructorHelpers::FObjectFinder<USkeletalMesh>armsCH(TEXT("SkeletalMesh'/Game/Animation/ArmsAndFlashLight/arms.arms_armmesh'"));
	static ConstructorHelpers::FObjectFinder<UAnimSequence>idleAnimation(TEXT("AnimSequence'/Game/Animation/ArmsAndFlashLight/arms_armmesh_Anim_Armature_Idle_001.arms_armmesh_Anim_Armature_Idle_001'"));
	armsSkeletalMesh = armsCH.Object;
	if (armsSkeletalMesh != nullptr)
	{
		arms->SetSkeletalMesh(armsSkeletalMesh);
		arms->SetRelativeLocation(FVector(30, -3, -30));
		arms->SetAnimationMode(EAnimationMode::AnimationSingleNode);
 		arms->PlayAnimation(idleAnimation.Object, true);
         }

   ,,,

}

However, this code doesn’t work, the animation doesn’t play.

2

Comparing to some code I have. . . try moving the PlayAnimation call into BeginPlay().
I don’t know if that will help or not.