WordPress中的上载文件重定向到Media-> Library页面，但未显示上载的文件

Question

我正在编写一个插件，该插件允许从管理区域上传文件（.txt，.xml）。这是管理页面中的代码：

HTML

<form action="upload.php" method="POST" enctype="multipart/form-data">
<input type="file" name="file">
<button type="submit" name="submit">UPLOAD</button>
</form>

PHP （upload.php）

if (isset($_POST['submit'])) {
$file = $_FILES['file'];

$fileName = $_FILES['file']['name'];
$fileTmpName = $_FILES['file']['tmp_name'];
$fileSize = $_FILES['file']['size'];
$fileError = $_FILES['file']['error'];
$fileType = $_FILES['file']['type'];

$fileExt = explode('.',$fileName);
$fileActualExt = strtolower(end($fileExt));

$allowed = array('txt','zip','rar','xml');

if (in_array($fileActualExt, $allowed)){
    if ($fileError === 0) {
        if ($fileSize < 500000) {
            $fileNameNew = uniqid('',true).".".$fileActualExt;
            $fileDestination = 'uploads/'.$fileNameNew;
            move_uploaded_file($fileTmpName,$fileDestination);
        } else {
            echo "Your file is too big!";
        }
    } else {
        echo "There was a problem uploading your file!";
    }
} else {
    echo "You can't upload files of this type!";
}

}

可以这样吗？