Can I upgrade my storage for my MacBook?

On your model, the processor, RAM memory and boot drive are all soldered to the mainboard for maximum reliability. They are not upgradeable.

You can use an additional external drive, and several are possible that do not completely ruin portability:

OWC envoy express

Sandisk SDSSDE60 about actual size, 1/4-in thick.

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MacBook Pro 13” 2017 two port model is not able to have its storage or memory upgraded.

There are more than a hundred computers that bear the name MacBook Pro, issued form 2006 to the current day. Some have replaceable components like drives, many do not.

¿which is yours, by model-year, early mid late and screen size?

Maybe. See if your MacBook Pro is listed here: https://eshop.macsales.com/shop/ssd/owc/macbook-pro