imac pro - 2 x 2tb storage
Alandata Recovery
In support documentation, Apple appears to make no mention of whether or not it is possible to upgrade the storage, even at an Apple Authorized Service Provider, so the safe assumption is that it is not possible to upgrade internal storage after purchase.
However, in a complete teardown of the iMac Pro, site sponsor OWC discovered that the SSD is removable, and it consists of two small modules, 512 GB each by default, (EMC 3197, 656-0061A). OWC also noted that the screws holding the modules in place are covered by a tamper-resistant VOID sticker. Consequently, removing the SSD does void the warranty.
In its own teardown, iFixit elaborated further that these are "raw flash modules" that "only have an interface buffer -- the PCIe/NVMe controller lies elsewhere."
More specifically, the SSD is controlled by the custom Apple T2 chip.
Storage Summary
It is possible to remove the iMac Pro SSD, but it might not be possible to install another one, particularly a third-party one, without the effective blessing of Apple's T2 chip. Apple may allow third-party SSD upgrades or independent companies may have to resort to clever hacks or workarounds.
Upgrading the SSD yourself also appears to void the warranty. Consequently, this definitely is not a good upgrade to perform yourself. Highly skilled technical users may find upgrades feasible should affordable storage become available after the warranty period, in particular.
To add more storage to your iMac Pro, the easy way is to go with an external SSD equipped with a Thunderbolt 3 port.
Also see: What external storage options are available for the iMac Pro? Which is the fastest?
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