First of all I would like to thank everyone who replied to my last post about how to put more spin on the ball in pendeulum serves, but I don't know if I'm doing it correctly, it's kind of confusing, I snap my wrist a lot but even so the ball doesn't seem to have a curve, for me in a sidespin pendeulum serve the ball would have to curve, otherwise it wouldn't have spin, but there are serves from professional players like ding ning in this video that when she serves it seems that there is no spin at all on the ball, but then it falls to the ground and you see that the ball spins wildly, and also I've been watching professional players serving in slow motion (Mainly Ma Long and Fan Zhendong) and imitating their movement seems even more difficult to rotate the ball, they go with the elbow back and turn it parallel after that, I do not know, it's strange, it was a long post sorry for that, but if anyone could clarify my doubts would be greatly appreciated, thanks in advance.

I can't post links because is my second post, so to see the ma long and ding ning serve that i mentioned you need to search "Adam Bobrow T2" and the serve it's on the very start of the video, and in ma long serve that i am confused about the moviment search ma long slow motion, dimitriv ovcharov mlfm and put at 1:38 of the video.