MacBookPro14,3 SSD Upgrade

Sorry, no. The SSD is soldered to the Logic Board on the Touchbar models. The only way to expand your storage is by using an external USB3 SSD or by purchasing another computer with more storage.

In fact all Apple laptops from 2018+ have integrated SSDs soldered to the Logic Board. Even the desktop Macs have unique proprietary SSDs which are not upgradeable after purchase.

Also, the memory in most Macs these days is also soldered to the Logic Board and cannot be upgraded after purchase.