Sometimes, we need to load 2D/3D assets at runtime in our unity application. We can do this by saving it into the "Resources" folder in the unity editor and they'll be availables after compilation to load them at anytime. The Asset Bundles https://docs.unity3d.com/Documentation/Manual/AssetBundlesIntro.html is an option to store assets and load them from a hard disk, a sdcard or, even, a server location. However, all these options need to use unity editor and, in the asset bundle case, Unity Pro Edition is required. This thread talks about a fbx format mesh importer. We can run in unity either free or pro editions since 3.5.6 version.