The app no longer sends me a notification before the substitution window closes. I'm stuck with whatever substitutions they make. The app tells you that you can start a return after you receive the item, but I don't think you can return food items to the store. Also, I don't want to have to return anything to the store. That defeats the purpose of having my order delivered to my house. It's been like this for a few months now. Walmart needs to fix their app.