With Microsoft charging $400 or so for an SSD upgrade, a DIY approach makes a ton of sense. But Microsoft’s being a little coy on whether they’ll do it for you.

While Microsoft touted the serviceability of the SSD inside the Surface Laptop 3 and Surface Pro X at the launch, Microsoft Store service agents tell PCWorld that the drive is replaceable, but not upgradable, by Microsoft Store employees. For now.
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https://www.pcworld.com/article/3447336/microsoft-wont-upgrade-your-surface-laptop-3s-ssd-at-a-microsoft-store-for-now.html