If you are using Ordoro for generating shipping labels, then Ordoro will automatically post your tracking numbers back into your Amazon seller central account every 2 hours and mark your orders as shipped. But in case you need an alternate route to upload tracking numbers into your Amazon seller central account, here is how you do it.
1. Login into your Amazon seller central account
2. Once you are in the account, click on Orders->Upload Order Related Files
3. If you don’t already have the template file, then download the template file
4. Fill out the template file, and upload it. Go to the orders page and verify that all the tracking numbers are showing up correctly