You can delete it and re-upload it if the website is not closed.

The Pdf format protects your files. Generally, you convert them from your computer first and then upload them. Take a look, if the last time is not up and the website is not closed, you can delete it and upload it again. Project applicants are requested to enter the National Natural Science Foundation of China project management system as soon as possible to check whether their project has been returned. If it is returned, the project applicant is requested to complete the repair of the full text of the achievements in the resume as soon as possible and regenerate the PDF file. The specific reasons for return can be viewed through the "Reason for Return" on the application list page. Applicants of each project are requested to log in to the system as soon as possible to check and confirm whether the status of their application has been returned.