Hi J-G,
I tested my code on Win10 using CutePDF printer driver and then it works! The exact contents of Printer.Title is suggested for filename in the pop-up file menu. But if I use 'Microsoft Print to PDF' as PDF printer driver, Printer.Title is ignored and suggested filename is empty.
ps: Actually, my Win10 trials hints at a root cause for my other post on 'Multiple page PDF..' in this forum. See this.