

I have a work visa but I'm going to work at a new job
Hello, my named is Johnny and I'm an American working in Guangzhou and my Z type expires January 15. I will be moving to a new city and signing a new contract with a different school. What is the process for getting a new Z type? Do I have to leave the country? Do I also have to give them my passport? Or will it be the same process again, I have to get a letter? I am still working at my current school, so I need it for traveling purposes.
Sorry for all of the questions.
The school will help me apply for the new Z. I am just worried that I have to give my passport while I am still working and need it for traveling purposes within mainland.
If the process is easier and shorter because I'm already in the country with the Z type, that would be wonderful.