Hi, we're new to Dropbox and we're in need of help. As we scan, it's creating PDFs. We'll want to scan more (lots) into the same folder, group, etc., but we can only get a new PDF, not add to the existing PDFs in that folder. For example, we have a fleet of trucks. One might be Truck #30. We want to add many expenses/bills to Truck #30. We'll add a folder for Registrations, ones of Invoices, ones for other Truck #30 related item. How do we combine pdfs in one folder and not make multiple pdfs?