There are two very fast ports on this laptop that you can attach an external drive to. One option that is very convenient is to add a tiny button drive, often called a FIT drive. These extend only a tiny amount from the laptop, and can remain attached even in a sleeve or a case. Here is a link to such a drive that is very economical:
https://www.bestbuy.com/site/pny-256gb-elite-x-fit-usb-3-1-flash-drive-200mb-s-black/6347230.p?skuId=6347230