New icon reference help

I want to make new icon reference but I can't even find where to start on.
I found the icon(thumbnail) instance keys in 'module/sims.phone_tuning'

<T n="icon" p="InGame\UI\Icons\BuildBuy\SwatchPatterns\swatchPattern_gadgetSmlPhoneCellGEN_01_bluePolka.png">2f7d0004:00000000:79da57057115fd5c</T>

<T n="trait">149330<!--trait_Phone_BluePolka--></T>


So I created an empty package file and imported 'module/sims.phone_tuning' and changed the instance keys(79da57057115fd5c) to my custom one(F4FBA7B0F3CA3AB7) in both tuning xml and simdata xml. Of course I add the DST image with the new instance(F4FBA7B0F3CA3AB7). Like MizoreYukii did in this tutorial.
But it doesn't work in my case.


this is my package file.

please help