I got a kit of 4TB internal ssd module of Mac Pro this morning. Then use configurator 2 to upgrade it.
According to this guide, I upgrade my stock 1TB to 4TB now.
Revive or restore an Intel-based Mac using Apple Configurator 2
In rare circumstances, Apple computers may become unresponsive and the chip’s firmware must be revived.
support.apple.com
According to this guide, I upgrade my stock 1TB to 4TB now.