The file path to the source Asset that the build process used to generate the Packed Asset, relative to the Project directory.
Note: the same path may be repeated many times in the PackedAssets array, because PackedAssets track objects, and a single Asset can contain many objects.
Note: Some packed Assets might not have a source Asset. For example a Sprite Atlas that is generated at build time. Also, AssetBundles contain generated objects that do not come from any source asset, e.g. the AssetBundleManifest.