Hi neo, no unfortunately I'm not able to put a few particular icons in the \ui folder because they are licensed from an icon collection and the license terms say that the icons must be baked in to the resources of the application.

For those ones you'll notice in the HTML where the buttons are defined, that the icon file name says res:// in it, that means to look up the icon from the compiled resources section of the program. You need to change those to point to your icon file when you want to replace those ones.

- Michael