Accessing Files on Network Attached Storage from iPhone in Unity C#

I’m developing an application in Unity Game Engine that requires accessing files stored on a network-attached storage (NAS) from an iOS device. I’m writing in C# and I’m using Apple Time Capsule for testing. When I test on mac, files can be easily accessed by lines as simple as [login to view URL] ("/Volumes/Data/FolderName”); However, on an iOS device, this line doesn’t seem to return anything. I have very little knowledge in networking. Can my problem be solved by entering a different address or does it require developing a class that communicates with the NAS through some different protocol? I'll pay for the simple answer or to develop the class. the code has to be in c# though the project would require knowledge in unity, C#, networking, and access to a network attached storage and an iOS device