php error file not upload on this api code - php

Question

this api code is in php and server is in digitalocen and ubuntu 16.04.
we are try upload file but every time we show the error param missing .
we are try thi change folder permission 777 but nothing steel file is not uploading.the same code working 2 days ego but now code is not working.
<?php
include('conn.php');
include('function.php');
$user_id = $_POST['user_id'];
$dute_user_id = $_POST['dute_user_id'];
$music_id = $_POST['music_id'];
$music = $_FILES['music']['name'];
$hashtags = $_POST['hashtags'];
$video = $_FILES['video']['name'];
$gif = $_FILES['gif']['name'];
$microtime = round(microtime(true) * 1000);
validate_user($con, $user_id);
if($user_id=="" || $video=="" || $gif=="" || ($music_id=="" && $music=="")){
$res['status'] = 0;
$res['msg'] = "param missing";
echo json_encode($res);
die;
}
else{
$user_data = mysqli_fetch_assoc(mysqli_query($con, "SELECT * FROM `user` WHERE `user_id`='".$user_id."'"));
if($music_id=="" && $music!=""){
$music = basename($_FILES["music"]["name"]);
$fileType = strtolower(pathinfo($music,PATHINFO_EXTENSION));
$music_file = "music/" . $microtime .".". $fileType;
move_uploaded_file($_FILES["music"]["tmp_name"], $music_file);
$title = "original - " . $user_data['user_name'] . rand(1111,9999);
mysqli_query($con, "INSERT INTO `music` (`title`, `user_id`, `m_link`, `time`) VALUES ('".$title."', '".$user_id."', '".$music_file."', '".$microtime."')");
$music_id = mysqli_insert_id($con);
mysqli_query($con, "INSERT INTO `m_category` (`music_id`, `category_id`) VALUES ('".$music_id."', '1')");
}
if($video!=""){
$video = basename($_FILES["video"]["name"]);
$fileType = strtolower(pathinfo($video,PATHINFO_EXTENSION));
$video_file = "video/" . $microtime .".". $fileType;
move_uploaded_file($_FILES["video"]["tmp_name"], $video_file);
}
if($gif!=""){
$gif = basename($_FILES["gif"]["name"]);
$fileType = strtolower(pathinfo($gif,PATHINFO_EXTENSION));
$gif_file = "gif/" . $microtime .".". $fileType;
move_uploaded_file($_FILES["gif"]["tmp_name"], $gif_file);
}
mysqli_query($con, "INSERT INTO `post`(`music_id`, `v_url`, `user_id`, `dute_user_id`, `gif_url`, `time`) VALUES ('".$music_id."', '".$video_file."', '".$user_id."', '".$dute_user_id."', '".$gif_file."', '".$microtime."')");
$post_id = mysqli_insert_id($con);
if($dute_user_id!=""){
mysqli_query($con, "INSERT INTO `post_hashtag`(`post`, `hashtag`) VALUES ('".$post_id."','duet')");
}
if($hashtags!=""){
$hashtag = explode("#", $hashtags);
for($i=0; $i < count($hashtag); $i++) {
mysqli_query($con, "INSERT INTO `post_hashtag`(`post`, `hashtag`) VALUES ('".$post_id."','".$hashtag[$i]."')");
}
}
$res['status'] = 1;
$res['msg'] = "Post Uploaded Successfully";
echo json_encode($res);
die;
}
?>
result
{"status":0,"msg":"param missing"}
here is postman error image