background: 
 the frontend needs to pass two values of  projectId  and  fileList []  to the backend. 
 normally, I just need to encapsulate these two values in a  data  and pass them to the backend, which will receive them. But now, the back-end interface method looks like this: 
 
:
- fileLsit[]- projectId?()
- post- data
: 
my little partner (back end) and I are both novices, and we are not very familiar with each other in many places. I hope you can give me more advice. Thank you.
