WordPress not adding files properly to Media Library - php

Question

I'm busy making my own theme in WordPress. I am using a handler to add media files to WordPress library. It is located in functions.php and looks like this:
function handle_logo_upload()
{
if ( !function_exists( 'wp_handle_upload' ) ) {
require_once( ABSPATH . 'wp-admin/includes/file.php' );
}
$uploadedfile = $_FILES['file'];
$upload_overrides = array( 'test_form' => false );
$movefile = wp_handle_upload( $uploadedfile, $upload_overrides );
if ( $movefile ) {
$wp_filetype = $movefile['type'];
$filename = $movefile['file'];
$wp_upload_dir = wp_upload_dir();
$attachment = array(
'guid' => $wp_upload_dir['url'] . '/' . basename( $filename ),
'post_mime_type' => $wp_filetype,
'post_title' => preg_replace('/\.[^.]+$/', '', basename($filename)),
'post_content' => '',
'post_status' => 'inherit'
);
$attach_id = wp_insert_attachment( $attachment, $filename);
echo '<br>';
//return $attach_id;
var_dump($uploadedfile);
//wp_die('end');
}
return 'fail';
}
At the bottom of this code, you can see var_dump($uploadedfile); This is returning NULL.
Also, when I upload an image using the theme function, i get a file looking like this in the media library: http://pasteboard.co/wgpYJRq.png
What the first thing that comes to mind?