Auto save word document not running if document opened using VBA?

[Agent Smith]

I have a word document I want to automatically save when it's closed. I found the code required to do this and it works:

To use application events do the following:
a. In your project add a new Class module.
b. Rename the module to (for instance): oAppClass
b. In this module paste the following code:

Option Explicit

Public WithEvents oApp As Word.Application
Private Sub oApp_DocumentBeforeClose(ByVal Doc As Document, Cancel As Boolean)
    ActiveDocument.Save
End Sub

c. This class needs to be instantiated so add a new (normal) module.
d. in this module paste the following code:

Option Explicit
Dim oAppClass As New oAppClass

Public Sub AutoOpen()
    Set oAppClass.oApp = Word.Application
End Sub

The problem I have is I open the document from access using:

Dim oWord As Word.Application
Dim oDoc As Word.Document
Dim WordRange As Word.Range
Set oWord = New Word.Application
With oWord
      Set oDoc = .Documents.Open(Receipt, , False)
End With
Set WordRange = oDoc.GoTo(What:=wdGoToBookmark, Name:="Details")
WordRange.InsertAfter Title & " " & [First Names] & " " & Surname & Chr(13) & ([Address 1] + Chr(13) + Chr(10)) & ([Address 2] + Chr(13) + Chr(10)) & ([City] + Chr(13) + Chr(10)) & ([Postal Code])
Set WordRange = oDoc.GoTo(What:=wdGoToBookmark, Name:="Date")
If (WeekdayName(Weekday(Date))) <> "Monday" Then
    WordRange.InsertAfter WeekdayName(Weekday(Date) - 1) & " " & Format(Now, "long date") 'need -1 to set correct day or change in control panel
Else
    WordRange.InsertAfter "Sunday" & " " & Format(Now, "long date")
End If
oWord.ActiveDocument.SaveAs filename:=drive & "Receipts\" & [First Names] & "_" & Surname & "_" & [ID] & ".docx"
oWord.Quit
Set oWord = Nothing
Receiptexists:
Set oWord = New Word.Application
With oWord
    Set oDoc = .Documents.Open(drive & "Receipts\" & [First Names] & "_" & Surname & "_" & [ID] & ".docx", , False)
End With
oWord.Visible = True
oWord.Activate
oWord.Application.WindowState = xlMaximized

When I put the code to auto save into the document, save it as .docm open the file on its own, it saves fine when you close it. When I open it using the above code (having changed the docx to docm) upon manually closing it doesn't save.

Can anyone help with what is going wrong?