I got undefined index while upload file - php

Question

Where is my mistake in php code or html? I want upload file .jpeg or .pdf in my db. All field in form were saved except the ile that i want to upload.
So here is my php code,
<?php
if(isset($_POST['new']))
{
$host="xxx";//host name
$username="xxx"; //database username
$word="";//database word
$db_name="xxx";//database name
$tbl_name="doc"; //table name
$con=mysqli_connect("$host", "$username", "$word","$db_name")or die("cannot connect");//connection string
$title =$_REQUEST['title'];
$date = $_REQUEST['date'];
$from_to = $_REQUEST['from_to'];
$details = $_REQUEST['details'];
$d_location = $_REQUEST['d_location'];
$d_stat = $_REQUEST['d_stat'];
$upfile = $_REQUEST['upfile'];
$in_ch=mysqli_query($con,"insert into doc(`title`,`date`,`from_to`,`details`,`d_location`,`d_stat`,`upfile`) values ('$title','$date','$from_to','$details','$d_location','$d_stat','$upfile')");
if($in_ch==1)
{
echo'<script>alert("Inserted Successfully")</script>';
}
else
{
echo'<script>alert("Failed To Insert")</script>';
}
}
?>
and this is my html form
<form action="" method="post" enctype="multipart/form-data">
<input type="hidden" name="new" value="1" />
<p><input type="text" name="title" placeholder="Fail Title" required />
<input type="date" name="date" placeholder="Date" required /></p>
<p><input type="text" name="from_to" placeholder="From/To by" required /></p>
<p> Details: <br><textarea name="details" required></textarea></p>
<p>Location: <select name="d_location">
<option value="Local A">Local A</option>
<option value="local B">Local B</option>
<option value="local C">Local C</option>
</select></p>
<p>Status: <select name="d_stat">
<option value="Active">Active</option>
<option value="Inactive">Inactive</option>
</select></p>
<p>Choose file to upload: <input type="file" name ="upfile" required/></p>
<input name="submit" type="submit" value="Create new" />