Im not 100% sure what youre trying to accomplish, but if youre trying to take an asset from one project and put it into another you have to right click on the asset in the content browser and chose “Migrate”
Then browse to the content folder of the correct project, and it will import all the associated files of that asset into the folder of a different project of your chosing. This is especially helpful when wanting to use Epic’s assets from their demos in your own projects.