For some reason when I attempt to import a new asset that I have used before on another project, I cannot seem to import the asset. I do not know why as I am still a beginner but every folder appears empty inside the asset as well. Thanks.
What you could potentially try is save the assets, that you want from your other project in a UnityPackage and Import that into your project.
This should hopefully save your assets. Also check that if you are importing Objects… that the models are included as well. Without the Mesh you wont see anything anyway. ^-^
Hope this helps you in any way.