Question about adding custom symbols to Ignition symbol libraries

Hello I have a question how to add my own SVG as an icon in Ignition library?
What I have already found is the information that I should prepare a library along the lines of the following code:

<?xml version="1.0" encoding="utf-8"?>
 
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">   
    <!--Red Circle-->
    <svg viewBox="0 0 24 24" id="red-circle">
        <circle cx="12" cy="12" r="6" stroke="black" stroke-width="1" fill="red" /> 
    </svg>
     
    <!--Blue Circle-->
    <svg viewBox="0 0 24 24" id="blue-circle">
        <circle cx="12" cy="12" r="6" stroke="black" stroke-width="1" fill="blue" /> 
    </svg>
</svg>

These two graphics appear in the designer when I select the indicated library however when I want to add my own svg I fail.

What are the rules for adding such svg icons. I conclude that it has to be done strictly according to the pattern but I don't know much about SVG graphics. Is anyone able to tell how to add a sample icon from SVG code?

For example:

<?xml version="1.0" encoding="utf-8"?>


<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 256 256" enable-background="new 0 0 256 256" xml:space="preserve">
<metadata> Svg Vector Icons : http://www.onlinewebfonts.com/icon </metadata>
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</svg>

Best regards,
Michał

This post solved my probem: