In Word document, we can insert the document name by using the fields, but if the document has been renamed, the file name filed cannot be updated automatically. In this tutorial, I introduce the way to auto update all field codes after reopening the document in Word.
Auto update field codes when reopen in Word
In Word, there is no built-in function can update the inserted fields, except the VBA code.
1. Press Alt + F11 keys to enable Microsoft Visual Basic for Applications window, double click ThisDocument in the left pane to open the ThisDocument (Code) window.
2. Copy and paste below code to the ThisDocument (Code) window.
VBA: Refresh field codes when reopen the document
Sub AutoOpen()
'UpdatebyExtendoffice20180830
Dim xRange As Range
Dim xFiled As Field
For Each xRange In ActiveDocument.StoryRanges
For Each xFiled In xRange.Fields
xFiled.Update
Next
Next
End Sub
3. Click 
to save the code in Microsoft Visual Basic for Applications window, a Microsoft Word dialog pops out, click No to go to the Save As dialog.
4. In the Save As dialog box, select a folder to save the document, name it as you need, select Word Macro-enabled Document from the Save as type drop-down, and then click the Save button. See screenshot:
From now on, every time you open the Macro-enable document, all field codes will be updated automatically.
Note: Make sure the Enable all macros (not recommended; potentially dangerous code can run) option is checked in Trust Center dialog (Click File > Options > Trust Center > Macro Settings).
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