Convert Shared folder path to UNC path

I'm trying to convert current shared folder path to unc path by manipulating current path with computer name. However result in compile error: expected array on the line"elem = UBound(CurrentPathA)" in Public Function UNCpath(). Can you guys tell me what seems to be the problem causing this issue? and perhaps share better idea to get unc path?

    Option Explicit

    #If VBA7 Then
    Private Declare PtrSafe Function fnGetComputerName Lib "kernel32" Alias "GetComputerNameW" (ByVal lpBuffer As LongPtr, ByRef nSize As Long) As Long
    #Else
    Private Declare Function fnGetComputerName Lib "kernel32" Alias "GetComputerNameW" (ByVal lpBuffer As Long, ByRef nSize As Long) As Long
    #End If

    Public Function GetComputerName() As String
    Const MAX_COMPUTERNAME_LENGTH As Long = 31

    Dim buf As String, buf_len As Long

    buf = String$(MAX_COMPUTERNAME_LENGTH + 1, 0)
    buf_len = Len(buf)

    If (fnGetComputerName(StrPtr(buf), buf_len)) = 0 Then
    GetComputerName = "ErrorGettingComputerName"
    Else
    GetComputerName = Left$(buf, buf_len)
    End If
    End Function


    Public Function UNCpath() As String
    Dim CompName As String, CurrentPath As String, CurrentPathA As String

    CompName = GetComputerName()
    CurrentPath = ThisWorkbook.Path
    CurrentPathA = Split(CurrentPath, "\")
    elem = UBound(CurrentPathA)
    CurrentPath = CurrentPathA(elem)
    UNCpath = "\\" & CompName & "\" & CurrentPath
    End Function