Storing exports on disk

Exports can easily be stored on any filesystem that Laravel supports.

public function storeExcel() 
{
    // Store on default disk
    Excel::store(new InvoicesExport(2018), 'invoices.xlsx');

    // Store on a different disk (e.g. s3)
    Excel::store(new InvoicesExport(2018), 'invoices.xlsx', 's3');

    // Store on a different disk with a defined writer type. 
    Excel::store(new InvoicesExport(2018), 'invoices.xlsx', 's3', Excel::XLSX);
}