Upload assets to Wordpress

functions.php

<?php

function upload_asset( $location, $post_id ) {
	$timeout_seconds = MINUTE_IN_SECONDS * 10;
	$tmp_file = download_url( $location, $timeout_seconds );
	if ( is_wp_error( $tmp_file ) ) {
		@unlink( $tmp_file );
		return false;
	}
	$type = wp_check_filetype( $tmp_file );
	if ( is_null( $type ) ) {
		@unlink( $tmp_file );
		return false;
	}

	$file = [
		'name' => basename( $location ),
		'tmp_name' => $tmp_file,
	];
	$attachment_id = media_handle_sideload( $file, $post_id );
	if ( $attachment_id ) {
		return $attachment_id;
	} else {
		@unlink( $tmp_file );
		return false;
	}
}