Use multiple adafruit neopixel shields

Hi, i know that it's a simple question but i wanna make it clear. :o
I tried to use 3 adafruit neopixel shields by one microcontroller(Arduino UNO).
However it doesn't work at all.
So my question is that am I doing just wrong? or it's certainly impossible to use three shields at one Arduino UNO.

“So my question is that am I doing just wrong? ”

You are not giving us enough information.

What shield?

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