在 Packages/manifest.json 中添加依赖项：
"dependencies": {
"com.leancloud.storage": "https://github.com/leancloud/csharp-sdk-upm.git#storage-${latest-version}",
"com.leancloud.realtime": "https://github.com/leancloud/csharp-sdk-upm.git#realtime-${latest-version}"
}