Questions about Yeelight Wireless Smart Dimmer

I had already bought it to combine with a xiaomi mi ceiling light: https://www.digitec.ch/it/s1/product/xiaomi-mi-ceiling-light-3100-lm-applique-plafoniera-11413947?supplier=406802 Unfortunately, I could not match it. In the comuniy they told me that it is possible. Is there a foolproof procedure? When I tried, the light was on and connected to the Yeelight app. The button flashed, but it did not connect to the lamp. Thank you very much ,