Access Macro Converted to VBA then Editted only Executing Access Defined Code - ms-access

Question

I have set up a basic macro where I export the contents of a table to excel. Macro works great, but now I want to create a check to see if the file name that I am saving to already exists, and if so, deletes that file so that I do not have the user deal with the prompt box asking if they would like to overwrite the file.
I converted the macro to VBA so that I could add in the desired dir(filename) and kill(filename) code. Once completed I was able to successfully run the code in the VBA editor, however, when I tried running the code based on the "on close" event of a form I have in access, it will only run the code as viewed in the access macro structure, as if I never added any additional lines of code in the VBA editor. Is there something that I was supposed to do to convert back from VBA to Access once I completed my edits?
Please see below for code that I would like to execute:
Function ExportLot()
On Error GoTo ExportLot_Err
Dim filename As String
filename = "\\server1\Trial
Database for QS Reports\Lot Log Report.xlsx"
DeleteFile (filename)
DoCmd.OutputTo acOutputQuery, "LLUnion", "ExcelWorkbook(*.xlsx)", filename, False, "", , acExportQualityPrint
ExportLot_Exit:
Exit Function
ExportLot_Err:
MsgBox Error$
Resume ExportLot_Exit
End Function
Function FileExists(ByVal FileToTest As String) As Boolean
FileExists = (Dir(FileToTest) <> "")
End Function
Sub DeleteFile(ByVal FileToDelete As String)
If FileExists(FileToDelete) Then 'See above
' First remove readonly attribute, if set
SetAttr FileToDelete, vbNormal
' Then delete the file
Kill FileToDelete
End If
End Sub
Original converted code (what currently runs when I call ExportLot from the form):
Function ExportLot()
On Error GoTo ExportLot_Err
Dim filename As String
DoCmd.OutputTo acOutputQuery, "LLUnion", "ExcelWorkbook(*.xlsx)","\\server1\Trial Database for QS Reports\Lot Log Report.xlsx", False,"", , acExportQualityPrint
ExportLot_Exit:
Exit Function
ExportLot_Err:
MsgBox Error$
Resume ExportLot_Exit
End Function

Answer 1

I managed to figure out either the solution to or a work around for this problem. I created a new macro (ExecuteCloseCode), and used the RunCode Event to call my function (ExportLot()) as defined in the question.
Then I used the on close event to call the "ExecuteCloseCode".
I am not sure why this method worked and my previously proposed efforts did not...