I am making an endless running game in which i spawn boulders which are destructible and non destructible . I spawn both randomly but the problem is only NON Destructible mesh can be seen. the Destructible mesh can only be seen after the collision. You can even see the difference in preview which i have attached here.
I am not sure what you are quite asking for. You are saying that they cannot be seen yet you shared an image of you thumbnails of your content browser. If you want to fix the image, just switch to thumbnail edit mode. and then drag the image of you item
But still when the character hits the breakable boulder the boulder explodes and the debris are seen. Until the character hits the boulder it cannot be seen.