wénjiàn míng zuìhǎo xiě qīngchǔ bǎnběn, bǐrú "dì èr zǔ bàogào chūgǎo" "dì èr zǔ bàogào zuìzhōng bǎn"

文件名最好写清楚版本，比如“第二组报告_初稿”“第二组报告_最终版”。

It's best to write the version clearly in the filename, like "Group 2 Report Draft" or "Group 2 Report Final Version".