Ebay want private sellers to use Simple Delivery. If you do, the tracking is added automatically.
Business sellers don't have to use Simple Delivery, can choose their own postage and can add tracking.
With over 200 brand new items of jewellery for sale, you are clearly trading and should have a business account. Changing to a business account would resolve this issue.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)