Preserve file name

## 💬 Questions and Help

How can I preserve the file name of the cached object?

I'm storing the file to share it posteriorly using the putFile method to save and the getFileFromCache to retrieve it but I'm losing the file name in this process. Is there any way of preserving the file name or shall I implement my putFile method?

首先阅读 putFile 和 getFileFromCache 入口点，跟踪缓存对象的存储和返回方式。确定现有缓存元数据是否可以保留原始文件名；当获取对象时仍保留该名称，并通过适当的测试验证这一行为，即视为完成。

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