When you watched my first how-to video, I showed you how to built-up the „come when called“.
There are more than likely two types of puppies; the one that now bounces back and forth from one person to another, and the one that stays with you and looks at you. For both time has come to go ahead and train them just on your own. Here are steps 2 and 3.
You want to try and keep the bouncer longer with you by letting the puppy lick longer from the tube or by giving more than one piece of cheese/meat. While rewarding praise with „good here/come“.
Set the puppy free, and just before the leash is to become tight, call again.