Thank you tmpxyz,
You made a great work, as usual.
Of course I can, I just sent you an email.Thank you so much for your very professional support.
Thank you so much for the answer and to take the time to make a video to demonstrate :-)
I am using Unity 5.5 and I think my problem is not clear, a video would help better :
Thanks for the answer, it is exactly that.
Because it is not updated automatically I thought it did not work, but if I click on the timeline after pressed CTRL + Z I can see it came back to the previous state.
Thanks a lot, take care.
Customer support service by UserEcho