Editing Expense Purpose afterwards

Can anyone help and give me guidance on how to edit the purpose/note we provide on an expense? Being asked to change them for audit purposes but don’t see a way to do so. Anyone had any luck doing so?

There is no way of editing the purpose after the expense has been approved. What you can do is create a document, print it to PDF and then upload that as an additional attachment for the expense. That's the best that can be done.