The .blend files I have downloaded aren’t showing up and I need help on this because it isn’t even letting me drag them into the scene. A placeholder picture just shows up in the project window and unity doesn’t even know what it is!
Do you have blender installed? That’s neccessary for .blend files to work, Unity uses the blender installation on your computer to convert them to fbx.
I generally recommend people to use fbx files instead of blender files, as that’s faster and less error prone, and don’t require a blender install.