pixa tool doesn't support all palette formats. if I want to make a custom palette I need to find a software that can export the palette in viable format first. It's a very annoying workaround. if it's possible to add the color picker then I would really insist on adding it. It's a crucial tool for this kind of software. Or make it compatible with all palette formats. I used krita to make my custom palettes and the .kpl format is not supported.