I have searched all over the internet for help with this, but all of the solutions are to do things I've either already done or are not issues with my set-up. We recently bought a home in which the kitchen sink does not drain unless the disposal is running. The sink also fills with the wastewater from the dishwasher when that is running. The two most common causes of this problem, according to the internet, are that the wall drain is higher than the disposal drain, or that the dishwasher drain hose has not been attached to the underside of the counter or to the wall. However, as you will see in the pictures I have attached, neither of these is the case for me. I cannot imagine that the drain is clogged, as it works when the disposal is on. What am I missing? Thank you!