Why do I fail to upload the attachment in the Course Discussion?

为什么在课程讨论区上传附件失败？

youdao

Only one Red Inflatable Buoy is on the race course see Attachment.

在航线上只有一个红色浮标，如附件绕岛赛航线图。

youdao

Only one Red Inflatable Buoy is on the race course see Attachment.

在航线上只有一个红色浮标，如附件绕岛赛航线图。

youdao