How would i weld the char's arm to the viewmodel rig in camera?

I've recently made a viewmodel but it turns out that when i weld my player's arms into the viewmodel's rig which is located in the currentcamera puts my character on the ground and glitches everywhere.

Here is an attempt i've tried to do :

local WeldArm1 = Instance.new("Weld", char)
WeldArm1.Part0 = char["Left Arm"]
WeldArm1.Part1 = viewmodel["Left Arm"] --The viewmodel's rig arm

local WeldArm2 = Instance.new("Weld", char)
WeldArm2.Part0 = char["Right Arm"]
WeldArm2.Part1 = viewmodel["Right Arm"] --The viewmodel's rig arm

If you've found any fixes feel free to answer.

Thanks, TinfoilbotGamer