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It works just fine. Just make sure your Rescue Media is built using at least WinPE 4.0, although I'd recommend just going straight to WinPE 10 unless your system has trouble booting from Rescue Media built on that version. The reason for the WinPE version recommendation is that WinPE 3.1 (which uses the Windows 7 kernel) doesn't support NVMe/PCIe SSDs. Some systems offer a BIOS configuration option that masks the NVMe interface behind a storage controller. That allows WinPE 3.1 / Windows 7 to work with NVMe SSDs, but only if you also supply the necessary driver for that storage controller. And actually, if your system is configured that way, you might need to supply that storage controller driver to access your SSD even if you use a newer WinPE version for your Rescue Media. But if your system is NOT set up that way and instead exposes just the "raw" NVMe interface, then WinPE 4.0 or newer will see that SSD immediately with no drivers required since they support NVMe natively.
You can check your WinPE version by booting your Rescue Media and looking at the title bar (the very top edge of the screen), where both the Reflect and WinPE versions will be displayed. If you need to change the latter, launch Reflect under "real" Windows, go to Other Tasks > Create Rescue Media, click "Change PE Version", select the desired version, and proceed through the wizard all the way to creating new Rescue Media.