Currently, if you rename a drawing (Inventor/AutoCAD) that has a system generated PDF you also need to manually rename the PDF (In order for the PDF to be versioned). If you fail to do so, the next time a system generated PDF is created. It will create an additional PDF severing the link to the original (Now you have 2 PDF's that can cause confusion with users and history is broken). An option within the rename dialog box to also rename the attachments (PDF's) would be very helpful.