Replacing MacBook Pro Hard Drive?
See https://everymac.com/systems/apple/macbook_pro/macbook-pro-retina-display-faq/macbook-pro-retina-display-13-how-to-upgrade-ssd-storage.html for a lot of  details about how to upgrade the internal disk of a MacBook Pro, including information about compatible drive models and instruction on how to actually replace the drive.

It probably goes without saying, but make sure you have a good backup before you start.