Hello, dear. I'm glad to answer your question: What does ukey directory setting mean? A: Hello, dear, it's the location where files are saved. You can create three different folders. VAT Invoice Invoicing Software Tax UKey Edition Set Electronic Invoice Directory Tax ukey is VAT Invoice Invoicing software, and individuals and enterprises will often come into contact with it. When using tax ukey to invoice for the first time, you need to set the invoice directory first. Thank you for your patience.