I have a ticket from Taoyuan to Shanghai, why is it not included in the itinerary?

You can enter the ticket number and enter it manually.

Where did you see the itinerary you mentioned? If it is Air Travel, some low-cost airlines are not included, such as AirAsia, Spring and Autumn, etc., you need to go to their website to check your order<br/>If you have any questions, you can ask, if it is helpful, you can click Accept happy new year healthy

For low-cost airlines, the itinerary cannot be seen in some apps and needs to be entered manually.