Initialfilename from File/Save As input

Hello, I have code that subverts any saving to a custom subroutine. This works generally fine, but when I click the File tab and Save As by choosing a pinned folder, it only ever goes to My Documents. The relevant code is as follows:

Dim filename as string
filename = Application.GetSaveAsFilename( _
            InitialFileName:=Me.Name, _
            Title:="SaveAs")

How can I get the InitialFileName from the File/Save As prompt?