move_uploaded_file() function in php returns false even with rwxrwxrwx permissions and root as directory owner

Question

When I try to submit an uploaded file it prompts me "Failed to upload file" message. I'm using raspbian. I have set destination folder permissions to drwxrwxrwx. I have set folders user to pi. My projects files are located in /var/www/projectname/ folder but I want to move uploaded files to /media/pi/usbdevice/uploads which is USB device.

home.php file, HTML form code:

<form class="fileupload" action="home.php" method="post" enctype="multipart/form-data" >
    <h3>Upload File</h3>
    <input type="file" name="myfile"> <br>
    <button type="submit" name="save">upload</button>
</form>

backend code for fileupload:

$destination = '/media/pi/usbdevice/uploads/' . $filename;
$file = $_FILES['myfile']['tmp_name'];
if (move_uploaded_file($file, $destination)) {
    **function to insert info in database**
    echo "File uploaded successfully";
} else {
    echo "Failed to upload file.";
}