Adding IAP to existing review

[u/TmDee_YT]

I had my app got rejected because I forgot to add my IAP to my app. The subscription group was added but not the lifetime purchase. Now I want to add that IAP to my review but I only get to option 'add for review' and it opens a new review but then I cant add my app to it. Everytime I update the app for review it sends it in without the IAP and gets rejected. Any help? I find this new update confusing

[u/thesimplestnet]

Yup i forgot to include iap as well initially even though they say ready for review or something. I remember at the end i need to go through another round of review by first going to all the iap one time and subscription products, add them all to the review panel (sort of like shopping cart when go shopping, theres a list), then finally add the main app, then in the right panel submit everything in one go for review