There are too many uploads during this period, and the network is blocked, so it is impossible to return data. If you miss the network peak before uploading, it may be that the background server is under too much pressure!

If you don't know the reason, you can ask your tutor and ask him to help you try. If it really doesn't work, you can try to contact the teachers in the library to reflect the problem and feed back your failed interface information and the results of the tried methods to them. They may have a solution.