How to create and add a new livery to the A400M iniBuilds?

I’m new to MSFS, and despite my research on the internet and multiple attempts, I haven’t been able to figure it out.

I managed to import livery textures provided by third parties, but I can’t create my own due to the .KTX2 image format.

I thought I needed to use the SDK to create these textures, but after several attempts, I still don’t understand how to do it.

Would it be possible to get some help?

This question is better suited to Inibuilds channels, as they’re the authors of the product. You can probably locate peer livery creators there. Since there are commercially available paints for the aircraft in circulation, this doesn’t appear to be an SDK limitation.