Change Macro to save file in different folder

The macro below is SUPPOSED to save only the "Calculation" sheet to the file path listed in cell N5 (Calculation Sheet) and then show a message box showing where it was saved. For some reason the file is saving to either the last opened folder or the "My Documents" folder (no matter what I put in cell "N5" on the "Calculation sheet). However, the message box shows the file path that I have typed in cell N5. I cobbled this code together and have limited experience at VBA so it's time to call in an expert.

See attached worksheet.

Sheets("Calculation").Select
    Dim FileExtStr As String
    Dim FileFormatNum As Long
    Dim Sourcewb As Workbook
    Dim Destwb As Workbook
    Dim TempFilePath As String
    Dim TempFileName As String

    With Application
        .ScreenUpdating = False
        .EnableEvents = False
    End With

    Set Sourcewb = ActiveWorkbook

    'Copy the sheet to a new workbook
    ActiveSheet.Copy
    Set Destwb = ActiveWorkbook

    'Determine the Excel version and file extension/format
    With Destwb
        If Val(Application.Version) < 12 Then
            'You use Excel 97-2003
            FileExtStr = ".xls": FileFormatNum = -4143
        Else
            'You use Excel 2007-2013
                FileExtStr = ".xlsx": FileFormatNum = 51
            End If
    End With

    'Change all cells in the worksheet to values if you want
    With Destwb.Sheets(1).UsedRange
            .Cells.Copy
            .Cells.PasteSpecial xlPasteValues
            .Cells(1).Select
        End With
        Application.CutCopyMode = False

    'Save the new workbook and close it
    TempFilePath = Sheets("Calculation").Range("N5").Value
    TempFileName = Range("N4").Value
    
    With Destwb
        .SaveAs TempFileName & FileExtStr, FileFormat:=FileFormatNum
        .Close SaveChanges:=False
    End With

    MsgBox "You can find the new file in " & TempFilePath

    With Application
        .ScreenUpdating = True
        .EnableEvents = True
    End With

End Sub

I will actually need two different variations of this macro: 1). Macro as noted in my description above. 2). Macro to do basically the same thing (insert file name listed in "N4", in the file name box and go to file path listed in "N5") but stop at the SaveAs file dialog box so that the user can change the file name manually or the file path if they want to.

Thanks in advance for your help.

Take care.
Marvin