This problem has nothing to do with the original post. Exporting a blend mode is physically impossible as it’s a math operation on the pixels of the image + background. A PNG or JPEG image can’t contain any math functions, it only contains pixels. If you just export the image there is no background to make operations on so an image is exported without blend mode. If you wish to include the Figma canvas as a background for the blend mode you can disable “ignore overlapping layers” in the export settings (press •••).