admin：同学你好，论坛可以上传pdf文件，但是最大只能上传4M的pdf文件哈~~ 是不是你要上传的文件超过4M了？ 如果不是，那就很有可能是网络不稳定导致的，等网络好的时候，重新再试试就可以了。回到原帖
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