One of Microsoft's most exciting changes with the Surface Pro 7+ compared to its predecessor was the switch to replaceable SSDs. The company has finally gotten around to offering official upgrade modules too, albeit only for business customers. Apparently, Surface Pro 7+ SSD Commercial Spares will not work on the Surface Pro X or the Surface Laptop Go either, for some reason.
https://www.notebookcheck.net/Microsoft-announces-SSD-upgrade-modules-for-the-Surface-Pro-7-Plus.524445.0.html