[询问] also use this video as a trailer是何功能?

楼主: geofrania (三叶虫)   2014-08-03 23:20:19
我在脸书上传影片的时候
偶然看到有一个可以打勾勾的选项:
also use this video as a trailer
请问有人知道这个选项如果打勾了之后
会出现什么功能吗?
谢谢

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