I have a 3MF file, for some signs, with two color changes (first image). if I ADD another STL, it defaults to the primary color, but REMOVES (in PREPARE) my layer points for color changes. (2nd image). even if i DELETE the added STL, the color layer changes do not return (3rd image).
HOW to PRESERVE the color layer changes (in PREPARE), I KNOW i have to fix the primary color, i just want the LAYERS to stay intact, so i can then adjust primary color,change AMS colors if i have updated this, etc.
Did you ever find a remedy? I am having a very similar problem. I import a 3mf display stand and can put a layer color change in just fine. As soon as I import another file (Ive tried svg,3mf) it makes my layer color change disappear. I am just trying to add a logo to the stand.