please subscribe to this mod:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2008047359
and then go through the mod files and read them. That's how I learned how to add new emblems.

to add new emblem you have to:
1. edit 00_intelligence_agencies.txt (in "common\intelligence_agencies") to create new agency with new agency name and to define country that's going to use it
2. include the new two framed emblem in the "gfx\interface\operatives\agencies" directory
3. make the game recognize and load the new .gfx file (put the

spriteType = {
name = "GFX_your_file_name"
texturefile = "gfx/interface/operatives/agencies/your_file_name.dds"
noOfFrames = 2
}

script in the "interface" directory)

You can open and edit graphic files with getpaint.net and all other files with Notepad

tnx a lot dude , you helped a lot
jut to be sure , what kind of emblem should i use ? is it .dds
sry to bother you
can you specify what a two frame emblem is ?

2 framed means that the left side and the right side of the image should be treated as separate images. As you can see on the screenshots every image includes both "selected" and "unselected" versions of the emblem

Can you make a video?

no - I don't have any YouTube channel or anything like that :)

This instruction is not clear to me :(
Can you create it based on screens?

And i can't find this.
gfx\interface\operatives\agencies

Have you ever modded anything in Hearts of Iron IV? There's no easy way to add any new emblems.

I've learned everything on my own by reading through the game files and other mods files. That's what I would recommend to anyone who wants to learn modding.

By default for vanilla game "gfx\interface\operatives\agencies" directory should be in here:
C:\Program Files (x86)\Steam\steamapps\common\Hearts of Iron IV\gfx\interface\operatives\agencies

but it depends on the folder where the game was installed in the first place.

What I wanted to discuss was the creation of some sort of compatibility patch. I tried adding a new insignia with exactly the same steps you mentioned here, but it doesn't appear in game. What confuses me is that agency logos from Road to 56 appears, despite not being designed specifically to be compatible. Perhaps you can help?

Rt56 probably just overwrites "00_intelligence_agencies" file from my own mod - that's the most probable answer.