Hi!
I made everything exactly as in thr video, but when I rotate a bone my upper and lower arms attached to, meshes change their length and shape. Why is this happening?
did you remember to uncheck the deform button that could cause it.
Update -
Re-created Armature with all bones - and the problem has gone. The settings/structure/hierarchy are exactly the same as before. I still don’t get why did this happen.
did you forget to un chek the box for disform? that whas at leest my problem in the begining.