Uasset won't show up

I am trying to add a .uasset material to my project. I have copied it in the explorer window to the content folder and it does not show up in the project. I am not sure what else I should do to make it work. Is there another way to import it?

Count this as fixed. Figured out what was going on on my own. Still have an issue but I will post another question about it if it continues to be a problem.

Becasue of version not uniform .
You should check the file version