奇怪的文件上传失败

Question

它是AWS的Laravel。几个月前，上传在本地和AWS都运行良好。它们是部署的相同代码。我抓获了Input::all()：

在本地工作 :( Mac上的apache）

Array
(
[_token] => abc…… 
[text] => 
[file] => Symfony\Component\HttpFoundation\File\UploadedFile Object
    (
        [test:Symfony\Component\HttpFoundation\File\UploadedFile:private] => 
        [originalName:Symfony\Component\HttpFoundation\File\UploadedFile:private] => file.txt
        [mimeType:Symfony\Component\HttpFoundation\File\UploadedFile:private] => text/plain
        [size:Symfony\Component\HttpFoundation\File\UploadedFile:private] => 18
        [error:Symfony\Component\HttpFoundation\File\UploadedFile:private] => 0
        [pathName:SplFileInfo:private] => /private/var/tmp/phpetUgq0
        [fileName:SplFileInfo:private] => phpetUgq0
    )
)

在AWS失败：

Array
(
[_token] => xyc…… 
[text] =>
[file] => Symfony\Component\HttpFoundation\File\UploadedFile Object
    (
        [test:Symfony\Component\HttpFoundation\File\UploadedFile:private] =>
        [originalName:Symfony\Component\HttpFoundation\File\UploadedFile:private] => file.txt
        [mimeType:Symfony\Component\HttpFoundation\File\UploadedFile:private] => application/octet-stream
        [size:Symfony\Component\HttpFoundation\File\UploadedFile:private] => 0
        [error:Symfony\Component\HttpFoundation\File\UploadedFile:private] => 6
        [pathName:SplFileInfo:private] =>
        [fileName:SplFileInfo:private] =>
    )
)

没有常见错误，例如它必须是enctype="multipart/form-data"等，我已重新启动httpd和mysqld。

我担心它可能是一个基本的东西，但我不知道我应该看哪个方向。你能告诉我任何可能吗？谢谢！