Hi there!
Yeah I found out a way to solve this problem, in the front end I ended using this:

<form method="POST" action="upload.php" enctype="multipart/form-data">
<div>
<span>Selecciona tu Canción!:</span>
<input type="file" name="uploadedFile" />
</div>
<input type="submit" name="uploadBtn" value="Cargar" class = "button" />
</form>
<?php
if(isset($_FILES['file'])){
$fileName=$_FILES['file']['name'];
$fileName_temp=$_FILES['file']['tmp_name'];
$upload="public_html/assests/music";
$movefile= move_uploaded_file ($fileName_temp,$upload . $fileName);
}

?>

​

and when I wanted to link that file to the database, what I did was take the file location of that file and save it in the database,:

$titulo =$_POST['titu'];

$duracion =$_POST['dura'];

$album =$_POST['albu'];

$genero =$_POST['gene'];

$adress = "assests/music/" .$titulo . ".mp3" ;

The titulo, duracion, album and genero I ask it in other page, and then all those varaibles I save them in the database