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.
其实我有点搞不懂，第一次是我的锅，我把一个 noimage.png的档放在
documents/images目录中，使用者是无法用
但是我改了之后还是被拒绝...后来只好把 UIFileSharingEnabled 设成 NO了