Could not find part of Path when trying to test a Web Service

I have a web service where I need to have a third party transmit XML docs to a folder on our web server.  After much pounding on permissions, I can finally path to a folder at https://sierraproductioncenter.com/Hyphen/In/Order/  however the service is throwing an error that the folder path cannot be found.  If I copy and paste the path in an explorer window on web server it resolves to correct folder. 

Could not find a part of the path 'C:\inetpub\vhosts\sierraproductioncenter.com\HTTPDOCS\Hyphen\In\Order\'.

I even threw directory code in just in case the directory was reading some alternative location - but no.  What is wrong? 

WEB SERVICE:

Imports System
Imports System.IO
Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.ComponentModel

' To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
<System.Web.Script.Services.ScriptService()><System.Web.Services.WebService(Namespace:="https://sierraproductioncenter.com/")><System.Web.Services.WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _<ToolboxItem(False)> _
Public Class WebService1
    Inherits System.Web.Services.WebService<WebMethod()>
    Public Function SaveDocument(ByVal docbinaryarray As Byte, ByVal docname As String) As Boolean
        Dim docPath As String = Server.MapPath("~\Hyphen\In\Order\")
        Dim strdocPath As String = Server.MapPath("~\Hyphen\In\Order\") + docname

        If Directory.Exists(docPath) = False Then
            Directory.CreateDirectory(docPath)
        End If

        Dim objfilestream As FileStream = New FileStream(strdocPath, FileMode.Create, FileAccess.ReadWrite)
        Dim bw As BinaryWriter = New BinaryWriter(objfilestream)
        bw.Write(docbinaryarray)
        bw.Close()
        objfilestream.Close()

        Return True
    End Function

WEB SERVICE CALL:

Imports System.IO

Public Class DocumentService
    Inherits System.Web.UI.Page

    Dim sfile As String = Server.MapPath("~\Hyphen\In\Order\")

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Directory.Exists(sfile) = False Then
            Directory.CreateDirectory(sfile)
        End If
    End Sub

    Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim objfilestream As FileStream = New FileStream(sfile, FileMode.Open, FileAccess.Read)
        Dim len As Integer = CType(objfilestream.Length, Integer)
        Dim mybytearray() As Byte = New Byte(len) {}
        Dim myservice As localhost.WebService1 = New localhost.WebService1()

        objfilestream.Read(mybytearray, 0, len)
        myservice.SaveDocument(mybytearray(len), sfile)
        objfilestream.Close()

    End Sub