Asset Store packages are collections of files and data from Unity projects, or elements of projects, which Unity compresses and stores in one file with the
.unitypackage extension. Like a zip file, an Asset Store package maintains its original directory structure when it’s unpacked, as well as metadata about assets (such as import settings and links to other assets).
在 Unity Package Manager 中，选择 My Assets 筛选条件以查看您可用 Asset Store 资源包的列表。可按名称搜索 Asset Store 资源包。找到要使用的 Asset Store 资源包后，可将资源包下载并导入到 Package Manager 中。如果 Asset Store 资源包具有可用的较新版本，也可以直接在 Package Manager 窗口中对其进行更新。
You can use the Package Manager window to manage your Asset Store packages within your project. However, if you need to access your asset files directly, you can find them in the Asset Store package cache. This cache, which is separate from the global cache, makes reusing and sharing packages more efficient. You can find the Asset Store package cache in the following paths (which might be within hidden folders depending on your computer settings):
These folders contain subfolders that correspond to particular Asset Store vendors and are available after download and import. The Package Manager stores asset files inside the subfolders using a structure defined by the Asset Store package publisher.