Can confirm, importing weight maps/masks appears to be broken in UE 5.3. I can’t import .raw files as Unreal gives me a red error code saying it doesn’t recognize the bit depth. I tried .r16 and it just doesn’t do anything. (Yes, I checked the Layer Usage in Landscape Mode). PNG 8-bit and 16-bit work but are terrible quality for my 40x40km landscape. Terrible quality as in it looks like Minecraft with PNGs.