Thank you very much, the code runs successfully. 
But there is a problem. If I re-upload 4files.zip, I can't download the file. Can I download it by retrieving the elements in the webpage?
How to hide the download link? As shown below

But there is a problem. If I re-upload 4files.zip, I can't download the file. Can I download it by retrieving the elements in the webpage?
How to hide the download link? As shown below