It can be seen from your question that your company files are kept by yourself, not the personnel file agent, so it is easy to handle. There are two ways:

1, let the company issue a file forwarding letter, and the company will contact the Shanghai Student Affairs Center to directly forward the file to the current company.

2. Take your valid ID card and the relevant credentials of the files temporarily stored in the Shanghai Student Affairs Center, go directly to the Shanghai Student Affairs Center, extract your files (which must be sealed) and hand them over to the company.

Good luck!