No tracking on the app

I just asked a seller for the tracking number and he said to look at the listing. But I had already looked (on the app) and there was nothing. So I tried on a browser, and it’s right there listed under the heading in my Won Items list. I also received no email to let me know. Usually I thought you receive notification of this if the seller books through Trademe. Why not add this to the app. Surely that is how most people use Trademe.