[交流] 国际会议注册时Student选项为灰色的，无法选中怎么办

在进行国际会议注册时，学生价为460$，但是在注册页面这个选项是灰色的，选中不了。 在注册指南上是如下描述的： Student Registration - Excludes access to conference dinner. Students are required to upload a scanned copy of the student status proof (e.g., a letter issued by the school or the matriculation card) at the end of the registration process. The proof document must be in English and contains minimally the following information: 1) Student name 2) Student matriculation number (student ID with photo) 3) Expiration date (*Expiration / Expected graduation date should be later than the conference date) 4) University name 可是这个选项都没法儿选，怎么上传 the student status proof，有没有哪位大神遇到类似的状况，麻烦指点一下。

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