Navigation does not work with an imported static mesh

Hello, I am wondering if somebody could please help me. I am new to Unreal Engine have created a quick rough bit of landscape within Blender and then imported it, however for some reason the player cannot click anywhere to move, however, he can do so on normal basic objects such as a cube. I have left some links to show you what is going on, help would be amazing as I have been trying to fix this for two hours now with no positive output. Thank you for reading.