Documents/Inbox folder for opening file from another App

I registered my app to associate some filetypes. so when the file comes in the mail attachment, I use my app to open the file. My app will automatically create a "Inbox" folder inside my Documents folder, and save the file in "Inbox". This Inbox is special, because it prevents me to create a folder or move a file into it by program.

Question comes to me is:

1. What is the special for the "Inbox"? Can I change some setti开发者_开发百科ng, and it will allow me to create a subfolder inside?

2. What is normal solution for this?

Thanks

Cullen

Inbox is just a link to your email stuff. You should copy the files from there to your documents directory withNSFileManager.