The drop on recall requires 1) a solid understanding of your drop cue and 2) the ability to process that cue in motion.
You can do this at several levels of detail, depending on the needs of your dog. To see this exercise broken down into tiny bits, most appropriate for a dog working at a lower level of energy and desire, see this video here, starring Brito!:
For Dice, odds are extremely good that reward placement and a solid understanding of his down cue will shortcut what is required, and since I tend towards the easy way out when that is possible, I will start there.
If this approach doesn’t get me what I want reasonably quickly then I’ll change direction and break the exercise down into small pieces. But Dice loves movement, games, and hard work, so this is a better starting approach to keep him thinking.
Here’s his first session: