Foliage tool Problem!

hello! i am a newbie to unreal and there’s a issue with the foliage tool. I made a static mesh in blender and painted using megascans blend materials in UE4. Now when i am trying to add foliage on the mesh the brush is just + sign and not working as it should be. i have selected static mesh in settings. please help me out.

please provide us with some images showing your exact problem.