For the first time, I

Question

For the first time, I tried using my Kirby Sentria shampoo attachment. I've lost the manual but found instructions online for making the swap from regular vac to shampoo-er and got it all assembled. The foam laid down just fine, however, when I run the vac back over the foam to pick it up, there is not a stitch of water showing up in the tray. First I thought maybe it was bc I hadn't put that much of the foam/water onto the carpet, but 12 hours later, the carpet is still wet in spots. Clearly my assembly wasn't 100% but I don't know how to figure out what's wrong. Help!