Weapon not welding to arm

I am trying to make a weapon shoot and animate but it won’t stick the arm when I am turning it to animate. I am following this tutorial: https://www.youtube.com/watch?v=YhwavY-FEEo

This is the problem: https://gyazo.com/b7f9b5904dc6820c01b446d4503d040c

You might’ve messed up your easy weld or something is anchored. Not too experienced with Moon Animator but judging from watching a few minutes of the video, this might have been your problem.

Edit: Sorry, I didn’t watch the whole video but you could’ve also forgot to check the Animatable button in the bottom left when joining or joining in place.

I’ll look into it thanks for your help