Forest Collection Pack

Hello

I have the FBX forest collection source , and i wasn’t able to add it in to unreal i tried importing it , just copying it in to the content folder from windows ,
and i tried creating the folder structure with empty materials inside with the right names and still i didnt manage to import it ,

i emailed support multiple times and they are not answering , do you have any idea why ? Can you please help

all the best
Andrei