Вставьте атрибуты файла типа ввода формы в базу данных

Я хочу начать с того, что это будет мой первый пост на Stackoverflow, так что спасибо за помощь заранее.

Я пытаюсь создать форму, в которой я могу ввести имя, исполнителя, жанр и загрузить аудиофайл в папку.

У меня есть все настройки, кроме запроса не работает.

Вот форма:

<form action="upload" method="post" enctype="multipart/form-data">

<label for="musicName" class="col-sm-2 col-form-label col-form-label-lg">Title:</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="musicName" id="musicName" required />
</div>

<label for="musicArtist" class="col-sm-2 col-form-label col-form-label-lg">Artist:</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="musicArtist" id="musicArtist" required />
</div>

<label for="musicGenre" class="col-sm-2 col-form-label col-form-label-lg">Genre:</label>
<div class="col-sm-10">
<select class="form-control" name="musicGenre" id="musicGenre" required >
<option value="hiphop">Hip Hop</option>
<option value="trap">Trap</option>
<option value="pop">Pop</option>
<option value="edm">EDM/Dance</option>
<option value="rock">Rock</option>
<option value="rnb">RnB</option>
<option value="jazz">Jazz</option>
<option value="country">Country</option>
<option value="metal">Metal</option>
<option value="blues">Blues</option>
<option value="reggae">Reggae</option>
<option value="classical">Classical</option>
</select>
</div>

<label for="fileToUpload" class="col-sm-2 col-form-label col-form-label-lg"></label>
<div class="col-sm-10">
<label for="fileToUpload" class="uploadArea">drop a file to upload<div id="selectedFiles"><p></p></div></label>

<input type="file" name="fileToUpload" id="fileToUpload" class="hidden" multiple>
</div>
<label for="submitSong" class="col-sm-2 col-form-label col-form-label-lg"></label>
<div class="col-sm-10">
<input type="submit" value="Upload Image" id="submitSong" name="submitSong" class="btn btn-primary">
</div>

Затем сначала я делаю все свои проверки и т. Д.

<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);

$file_name = $_FILES["fileToUpload"]["name"];
$file_tmp = $_FILES["fileToUpload"]["tmp_name"];
$file_size = $_FILES["fileToUpload"]["size"];
$file_type = $_FILES["fileToUpload"]["type"];

$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submitSong"])) {
$check = filesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
$uploadOk = 1;
} else {
echo "<script>
alert(`File is not an audio file.`);
window.location.href=`music`;
</script>";
$uploadOk = 0;
}
}
// Check if file already exists
if (file_exists($target_file)) {
echo "<script>
alert(`Sorry, file already exists.`);
window.location.href=`music`;
</script>";
$uploadOk = 0;
}

$filesize = 5000000;

// Check file size
if ($_FILES["fileToUpload"]["size"] > $filesize) {
echo "<script>
alert(`Sorry, your file exceeds the limit of" . $filesize . " `);
window.location.href=`music`;
</script>";
$uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "mp3" && $imageFileType != "wav" && $imageFileType != "flac" ) {
echo "<script>
alert(`Sorry, only Mp3, Wav & Flac files are allowed.`);
window.location.href=`music`;
</script>";
$uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
echo "<script>
alert(`Sorry, your file was not uploaded.`);
window.location.href=`music`;
</script>";

И затем, наконец, я загружаю файл и атрибуты, которые пришли с ним

// if everything is ok, try to upload file
} else {
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {if(isset($_POST[`submitSong`]))
{
$song_title = mysqli_real_escape_string($mysqli, htmlentities($_POST[`musicName`]));
$song_artist = mysqli_real_escape_string($mysqli, htmlentities($_POST[`musicArtist`]));
$song_genre = mysqli_real_escape_string($mysqli, htmlentities($_POST[`musicGenre`]));
$current_time = `CURRENT_TIMESTAMP`;

$sql = "INSERT INTO songs (song_name, song_artist, song_genre, uploaded_at, song_link, user_id VALUES
($song_title, $song_artist, $song_genre, $current_time, $file_tmp," . $_SESSION[`userid`] . ")";
// ($song_title, $song_artist, $song_genre, $current_time, $file_tmp," . $_SESSION[`userid`] . ")";

$result = $mysqli->query($sql);

var_dump($result);

// echo "<script>
// alert(`You have succesfully uploaded: ". basename( $_FILES["fileToUpload"]["name"]). " !`);
// window.location.href=`music`;
// </script>";

}} else {
echo "<script>
alert(`Sorry, there was an error uploading your file.`);
window.location.href=`music`;
</script>";
// echo "Sorry, there was an error uploading your file.<br />";
}
}?>

Любая помощь будет оценена!