In the Content Browser go to the Animations/Notifes folder and go though each of the blueprints listed below and in thier Received_Notify function change the Tag input on the Component Has Tag node to FirstPersonArms like the example image below.

BP_AttachWeaponAttachment
BP_ChamberWeaponAmmo
BP_DestroyAttachment
BP_RemoveAttachment
BP_SpawnHoldable
BP_SpawnWeaponAttachment
BP_ThrowRelease

Then go to the BP_CharacterComponent and copy the video below.