Hello SamEA!
I think I found a new bug, about the file and image address. Now the file address is http://xxx.com/123test.rar. The 123 is random number and test.rar is file name. But if the file name is a special characters, Then the file address will error and can not access. I think We can use another address. For example, http://xxx.com/files/abcdefgh. The abcdefgh is random characters. Each file has a different random character. if it is a image. For example, http://xxx.com/images/abcdefgh.
If you think my idea could, I think the random characters length needs at least 8 digits.
How do you think of my idea?