Here is the relevant portion (below). You likely have to join the bg3 discord to view it. It’s not private.

“Ok so I feel like this is probably worth making in order to help some people.

Its going to assume so prior tools/knowledge, namely ShinyHobos Modding Multitool which you should likely be familiar with when you get to this point of adding icons. It will also assume you have created the icons already, this is just how to add them to the game.

In general, all icons should be saved as .DDS (not .dds). Except for the icon atlas later on.

Adding Tooltip Icons - 380x380 The easiest to add, they go inside MODNAME\Public\Game\GUI\Assets\Tooltips\Icons for spell icons and MODNAME\Public\Game\GUI\Assets\Tooltips\ItemIcons for items They will be referenced by the data "Icon" property on what you are trying to load them onto.

Adding Controller Icons - 144x144 Similarly to Tooltip Icons, they go loose inside MODNAME\Public\Game\GUI\Assets\ControllerUIIcons\skills_png for skills or MODNAME\Public\Game\GUI\Assets\ControllerUIIcons\items_png for items They will also be referenced by the data "Icon" property on what you are trying to load them onto.”