Media Upload Directory Issue

Hi
I have thumbnail image issue
Can you help me with this?
https://prnt.sc/nq5svl

Thank you in advance

/**
 * Upload User File.
 *
 * @param [type] $file video url.
 * @param [type] $post_id Post id.
 */
function king_upload_user_file( $file = array(), $post_id ) {

	require_once ABSPATH . 'wp-admin/includes/admin.php';

	$file_return = wp_handle_upload( $file, array( 'test_form' => false ) );

	if ( isset( $file_return['error'] ) || isset( $file_return['upload_error_handler'] ) ) {
		return false;
	} else {
		$filename = $file_return['file'];
		$attachment = array(
			'post_mime_type' => $file_return['type'],
			'post_content' => '',
			'post_type' => 'attachment',
			'post_status' => 'inherit',
			'guid' => $file_return['url'],
			);
		$attachment_id = wp_insert_attachment( $attachment, $file_return['url'], $post_id );
		require_once( ABSPATH . 'wp-admin/includes/image.php' );
		$attachment_data = wp_generate_attachment_metadata( $attachment_id, $filename );
		wp_update_attachment_metadata( $attachment_id, $attachment_data );
		if ( 0 < intval( $attachment_id ) ) {
			return $attachment_id;
		}
	}

	return false;
}

The page I need help with: [log in to see the link]