Problem importing assest

hi i use ue4 for making games but i have a problem when i try to import a asset to a project and open the project that asset was not found i then tried to import from my computer as i download that asset but even though it is a 3d asset it imports a 2d image (i imported the realistic forest pack) , i tried to import the asset a lot of time but it would not .

PLEASE CLARIFY MY DOUBT.

Hi there! What type of asset it is? What File extention it has?