Question : want copy to overwrite an old image

copy($uploadedfile,"newlocation/".$uploadedfile);

Answer : want copy to overwrite an old image

Not complicated really - you'd need a worksheet activate event and a selection change one - something like the code below.

FYI, down IS the standard.

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Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    If Not Intersect(Target, rnage("A:A")) Is Nothing Then
        Application.MoveAfterReturnDirection = xlDown
    Else
        Application.MoveAfterReturnDirection = xlRight
    End If
End Sub