Missing Solution container

I just now bought brand new L40 Ultra Gen 2
Not able to find solution container in the robo dock.
Checked all the packaging…
Is this common?

I learned after returning and purchasing a second one that the solution container is sold separately and not needed. From my understanding solution can be added to the clean water tank.

Hi there! The L40 Ultra Gen2 does not come with a built-in detergent solution container out of the box. If you want to use the auto detergent dispensing feature, you will need to purchase this accessory separately from the official Dreame store.

I purchased the auto detergent module and installed it. I then updated the app to include the auto add detergent feature. Do I still need to add solution to the water, or is it sufficient to just add the solution directly to the module and fill the water tank with only water?

I keep hearing a humming sound like a fan is on from the base unit constantly. How can I shut this off?