If your file has been sent away by the school, it should be in Chun 'an Personnel Bureau. You can call the staff to help you find it first. If it's not sent away, it's still in your university. Go back to school and look for it. If you want to stay in Shanghai and possibly settle down, you'd better transfer the file to the Human Resources and Social Security Bureau where your work unit is located, so that it will be much more convenient for you to call in the future. First take the registration card to report to Chun 'an Personnel Bureau. If it is overdue, explain it to the staff and they will understand. Then make up your file management fee, and then explain to them that you want to transfer the file to the Human Resources and Social Security Bureau of xx District, Shanghai. They will go through the formalities for you, issue a new dispatch card, and then assign your file to a new department, so you can report to the new department.
Besides, you have to pay a storage fee for these documents. How to charge in Shanghai can consult the local department.
If you don't understand, please ask.