windows系统中的zetero正常使用，pdf文档可以正常打开。但是ipad无法同步，显示The attached file could not be found.请问这是什么情况，应该如何解决？另外，我想在电脑上安装zotfile插件，但ztero软件中的附加组件功能点击无反应，这个又该如何解决？谢谢！
As suggested there, you're just at your file storage quota, so additional files aren't being uploaded from the computer where you added them and won't be available on other devices.
Upgrade Storage
As suggested there, you're just at your file storage quota, so additional files aren't being uploaded from the computer where you added them and won't be available on other devices.