Sync 2x ESP8266 LED

Hello, I have 2x ESP8266. These legs are supposed to work synchronously. I have watched several videos and it doesn’t work. I should click Sync on one LED strip and then the others should be synchronized?

may I suggest reading the documentation instead of watching videos?
https://kno.wled.ge/interfaces/udp-notifier/

Hello, I made a video about it:

Why not in English so the YT translatror cwn get this translated to all WORLD lang