It took two days to complete. There are two situations where this problem may occur: 1. When making several files, you exit midway and then make another file, resulting in the files not being in the same small directory. The solution is to delete and re-create all the supplementary files at once, and do not exit halfway. 2. When actively submitting supplementary documents, you need to add a corresponding request letter. If there is no request letter, there will be no application number by default.