Why does this code not work with a named range? - excel

Question

I'm a VBA newbie and did not write this code, credit goes to Ron de Bruin. I'm using it to retrieve the value from whichever cells I enter into the Range - line 12, from whichever files I select. It works with cell locations but all my files have different locations for the defined names. But when I put a defined name into the range, ie. Set rng = Range("cName1") it doesn't work. So basically how would I modify it so I can put a named range in (but also works with a cell location if possible...) Thank you in advance for any help!!
Sub Summary_cells_from_Different_Workbooks_1()
Dim FileNameXls As Variant
Dim SummWks As Worksheet
Dim ColNum As Integer
Dim myCell As Range, Rng As Range
Dim RwNum As Long, FNum As Long, FinalSlash As Long
Dim ShName As String, PathStr As String
Dim SheetCheck As String, JustFileName As String
Dim JustFolder As String
ShName = "Sheet1" '<---- Change
Set Rng = Range("D4:D20") '<---- Change
'Select the files with GetOpenFilename
FileNameXls = Application.GetOpenFilename(filefilter:="Excel Files, *.xl*", _
MultiSelect:=True)
If IsArray(FileNameXls) = False Then
'do nothing
Else
With Application
.Calculation = xlCalculationManual
.ScreenUpdating = False
End With
'Add a new workbook with one sheet for the Summary
Set SummWks = Workbooks.Add(1).Worksheets(1)
'The links to the first workbook will start in row 2
RwNum = 1
For FNum = LBound(FileNameXls) To UBound(FileNameXls)
ColNum = 1
RwNum = RwNum + 1
FinalSlash = InStrRev(FileNameXls(FNum), "\")
JustFileName = Mid(FileNameXls(FNum), FinalSlash + 1)
JustFolder = Left(FileNameXls(FNum), FinalSlash - 1)
'copy the workbook name in column A
SummWks.Cells(RwNum, 1).Value = JustFileName
'build the formula string
JustFileName = WorksheetFunction.Substitute(JustFileName, "'", "''")
PathStr = "'" & JustFolder & "\[" & JustFileName & "]" & ShName & "'!"
On Error Resume Next
SheetCheck = ExecuteExcel4Macro(PathStr & Range("A1").Address(, , xlR1C1))
If Err.Number <> 0 Then
'If the sheet not exist in the workbook the row color will be Yellow.
SummWks.Cells(RwNum, 1).Resize(1, Rng.Cells.Count + 1) _
.Interior.Color = vbYellow
Else
For Each myCell In Rng.Cells
ColNum = ColNum + 1
SummWks.Cells(RwNum, ColNum).Formula = _
"=" & PathStr & myCell.Address
Next myCell
End If
On Error GoTo 0
Next FNum
' Use AutoFit to set the column width in the new workbook
SummWks.UsedRange.Columns.AutoFit
MsgBox "The Summary is ready, save the file if you want to keep it"
With Application
.Calculation = xlCalculationAutomatic
.ScreenUpdating = True
End With
End If
End Sub