Technique Help, Please

Ace here again! This time I need some help figuring out which move Julio uses with his hands in this clip to get a card from the bottom to the top of the deck.

https://youtube.com/clip/UgkxdtBBeK_MnRFKVV0KHkxvR5wN1HDAGnJD?si=p9zAPcl9Bs8wGRhq