Changing filament colors, set in the Prepare tab to change at different layer heights, are not displayed in the Prepare tab, Paint window, or thumbnail image correctly.
It is not intuitive to slice the file, first, before expecting to see the different colors the model will print in. Even then, the thumbnail remains incorrect.
Displaying these color changes would properly represent the profile to people who may otherwise download the file and only see one color in the first window. They may not realize the colors were set at layer heights in the Preview tab, and immediately go to the Paint window to start coloring (I’ve done this). Showing the colors in the thumbnail image would more properly represent the profile and help those looking for a fast, multi-color print which can even be done without an AMS.