send Images in chats using PHP + jQuery + MYSQL - php

Question

I have a chat application which works absolutely fine for sending and receiving texts only but I want to send images/videos/ files through it.
This is the main home page which display the chats.
<script>
$ = jQuery;
var currentID = null;
var chatTimer = null;
var oldhtml="";
function fetch_data() {
$.ajax({
url: "select.php",
method: "POST",
success: function(data) {
$('#live_data').html(data);
}
});
}
function fetch_chat() {
$.ajax({
url: "fetch_chat.php",
method: "POST",
data: {
id: currentID
},
dataType: "text",
success: function(data) {
$("#chatbox").show();
$('#messages').html(data);
$("div.area").show();
if(oldhtml!==data) {
$('#messages').scrollTop($('#messages')[0].scrollHeight);
}
oldhtml=data;
}
});
}
$(document).ready(function() {
fetch_data();
setInterval(function() {
fetch_chat();
}, 500);
$(document).on('click', '.first_name', function() {
currentID = $(this).data("id1");
fetch_chat();
});
$("#sub").click(function() {
var text = $("#text").val();
$.post('insert_chat.php', {
id: currentID,
msg: text
}, function(data) {
$("#messages").append(data);
$("#text").val('');
});
});
});
</script>
and below is the fetch_chat.php which fetches the chat from databases.
<?php
require("config.php");
$user_to = $_POST['id'];
$res1=$db->query("select * from chats where user_from='$_SESSION[id]' AND
user_to='$user_to' OR user_to='$_SESSION[id]' AND user_from='$user_to' order
by id");
if($res1->num_rows){
while($row=$res1->fetch_object()){
if($row->user_from === $_SESSION["id"] ) {
echo "<div class='chat self'>
<div class='user-photo'><img src='img/user1.jpg'></div>
<p class='chat-message'> $row->msg</p>
</div>";
} else {
echo "<div class='chat friend'>
<div class='user-photo'><img src='img/user2.jpg'></div>
<p class='chat-message'>$row->msg</p>
</div>";
}
}
} else
echo "No msgs <br />";
?>
Now I want to save the info of the uploaded file in the database and the files into a folder/directory. The sender and receiver should be able to send and view the files respectively.