export certain worksheets using a userform

I would like to make exports based on the boxes I checked

therefore with a lot of help I build the following code

Private Sub CommandButton1_Click()
 Dim xSht As Worksheet, xFileDlg As FileDialog, xFolder As String, xYesorNo, I, xNum As Integer
 Dim xOutlookObj As Object, xEmailObj As Object, xUsedRng As Range, xArrShetts As Variant
 Dim xPDFNameAddress As String, xStr As String, rngExp As Range, lastRng As Range
 
 xArrShetts = sheetsArr(Me) 'do not forget the keep the sheetsArr function...

 For I = 0 To UBound(xArrShetts)
    On Error Resume Next
    Set xSht = Application.ActiveWorkbook.Worksheets(xArrShetts(I))
    If xSht.Name <> xArrShetts(I) Then
        MsgBox "Worksheet no found, exit operation:" & vbCrLf & vbCrLf & xArrShetts(I), vbInformation, "Kutools for Excel"
    Exit Sub
    End If
 Next

 Set xFileDlg = Application.FileDialog(msoFileDialogFolderPicker)
 If xFileDlg.Show = True Then
    xFolder = xFileDlg.SelectedItems(1)
 Else
    MsgBox "You must specify a folder to save the PDF into." & vbCrLf & vbCrLf & "Press OK to exit this macro.", vbCritical, "Must Specify Destination Folder"
    Exit Sub
 End If
 'Check if file already exist
 xYesorNo = MsgBox("If same name files exist in the destination folder, number suffix will be added to the file name automatically to distinguish the duplicates" & vbCrLf & vbCrLf & "Click Yes to continue, click No to cancel", _
 vbYesNo + vbQuestion, "File Exists")
 If xYesorNo <> vbYes Then Exit Sub
 For I = 0 To UBound(xArrShetts)
    Set xSht = Application.ActiveWorkbook.Worksheets(xArrShetts(I))
    
    xStr = xFolder & "\" & xSht.Name & ".pdf"
    xNum = 1
    While Not (Dir(xStr, vbDirectory) = vbNullString)
        xStr = xFolder & "\" & xSht.Name & "_" & xNum & ".pdf"
        xNum = xNum + 1
    Wend
    Set xUsedRng = xSht.UsedRange
    If Application.WorksheetFunction.CountA(xUsedRng.Cells) <> 0 Then
        Set lastRng = xSht.Range("A" & xSht.Rows.Count).End(xlUp)   'determine the last cell in A:A
        Set rngExp = xSht.Range(lastRng.Offset(-26), lastRng.Offset(, 7))  'create the range to be exported as pdf
        With xSht.PageSetup
              .PaperSize = xlPaperA4
              .PrintArea = rngExp.Address(0, 0)
              .Orientation = xlLandscape
              .FitToPagesWide = 1
              .FitToPagesTall = 1
        End With
        rngExp.ExportAsFixedFormat Type:=xlTypePDF, Filename:=xStr, Quality:=xlQualityStandard, IgnorePrintAreas:=False  'export the range, not the sheet
    End If
    xArrShetts(I) = xStr
 Next

 'Create Outlook email
 Set xOutlookObj = CreateObject("Outlook.Application")
 Set xEmailObj = xOutlookObj.CreateItem(0)
 With xEmailObj
    .Display
    .To = ""
    .cc = ""
    .Subject = "????"
    For I = 0 To UBound(xArrShetts)
        .Attachments.Add xArrShetts(I)
    Next
    If .DisplayEmail = False Then
        '.Send
    End If
 End With
End Sub

Private Function sheetsArr(uF As UserForm) As Variant
  Dim c As MSForms.Control, strCBX As String, arrSh
      For Each c In uF.Controls
            If TypeOf c Is MSForms.CheckBox Then
                If c.Value = True Then strCBX = strCBX & "," & c.Caption
            End If
      Next
      sheetsArr = Split(Mid(strCBX, 2), ",") 'Mid(strCBX, 2) eliminates the first string character (",")
End Function

Private Sub CommandButton2_Click()

Unload basicUserform

End Sub

the problem is when I run the code no attachments show up or can be found in the destination map I choose earlier.

I also put the file here so you can see for yourself.: https://easyupload.io/ufnmvr

I appreciate your help and time!