Your app has the UIFileSharingEnabled key set to true in the Info.plist,
but the Documents folder still includes files and folders not intended
for file sharing.
Next Steps
To resolve this issue, please move all files that are not intended for
user access via the file sharing feature to another part of your app's
sandbox. When file sharing is enabled, the entire Documents folder is
used for file sharing.
其實我有點搞不懂，第一次是我的鍋，我把一個 noimage.png的檔放在
documents/images目錄中，使用者是無法用
但是我改了之後還是被拒絕...後來只好把 UIFileSharingEnabled 設成 NO了