The animal does not ask for the meaning of its existence. It exists in the context of the meaning of creation, but has no sensual access to it. Therefore it is simple. And has no problem with that. The concept of „meaning“ is unknown to it.
Man asks for the meaning of his existence. Since he asks for it, something like meaning exists and can be experienced by him. If it were otherwise, he, like the animal, would have no concept of the idea of a meaningful life.
The perception of meaning takes place through his soul access to the world. His soul perception. His soul sense. In this he differs from the animal on earth.
If he is secure in this perception, then there are no open questions for him.
It is just that man is forced to live predominantly in his animal existence. In this existence he has no access to his soul knowledge. At some point, perhaps as a small child, he learned what the meaning of his whole existence is, but he had to suppress this knowledge again in favour of material information and is now desperately searching for the meaning of his life. He has an idea of the concept through the remnants of his spiritual knowledge. But he no longer has conclusive access to it because he is held in his material, animal existence in which there is only the senseless struggle for survival.
The meaning is inexpressible. It lies exclusively in the experience of oneness. It is in another dimension than the struggle for survival, which seems so meaningless.