dnn bug, "Upload New File" don't display untill File location DropDownList changed

如果在dotnetnuke3.0.13中你使用了Documents，让用户提交文件，你会发现，如果用户只有一个可写的文件夹，用户将不能上船文件
Core module Documents, "Upload New File" don't display untill File location DropDownList changed

When a user has "write to folder" Permission to  only one folder the "upload New File" will never display.

If the user has two or more folders to write, he still has to select and change the dropdownlist to see the LinkButton!

see bellow:

Select the Url for the Document

Link Type: URL ( A Link To An External Resource ) File ( A File On Your Site ) File Location: Root test test/tt File Name: book.gif Upload New File Track Number Of Times This Link Is Clicked? Log The User, Date, And Time For Every Link Click? Open Link In New Browser Window?

解决办法，任何一个用户都给多于一个目录的写权限，或者修改源代码