> Provide a reproducible warehouse or example

[K1IRVING]

提供一个可重现的仓库或者示例

重现示例：

https://codesandbox.io/s/elegant-austin-vo6mx?fontsize=14&hidenavigation=1&theme=dark

beforeUpload 返回promise时就会复现，fileList只有最后一个文件。

Originally posted by @K1IRVING in #3766 (comment)

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