文件名乱码原因已查明：从网页上传STEAM的ZIP压缩包的时，解压缩会导致中文文件名变乱码。
以前没有这种问题。可能STEAM官方最近有更新，兼容性还不稳定。
我换成SDK方式再次打包上传，现在没有BUG了。

The reason for the garbled file name has been identified: when uploading STEAM's ZIP compressed file from a webpage, decompressing it will cause the Chinese file name to become garbled.
There was no such problem before. There may be recent updates from STEAM official, but compatibility is still unstable.
I switched to SDK mode to package and upload again, and now there are no bugs.