About the technique
The Pop-Up is generally considered the "beginners" version of an Air Stall . It is simpler to execute and easier to do consistently for newer players with the con of temporarily loosing possession during the move. There are situational use cases for a Pop-Up over an Air Stall but once the Pop-Up is mastered it is highly suggested to learn the Air Stall as a more advanced vertical movement technique.
Step by step

• Shoot the ball upwards. (low power do not charge the shot.)
• Wait for your beetles post shoot animation to end.
• Headbutt Grab upwards towards the ball.

Note

The animation is very short but if you try and headbutt grab upwards too soon after shooting , during your Beetles recovery animation , your input will be ignored and you will have to re-click the headbutt button.