Reformat the new drive as GPT first.
I checked Properties of the M.2 SSD in Windows Disk Management — it is already GPT. So it must be formatted(?)*, but it doesn’t show up in File Explorer. So, do I need to 1st create a “New Simple Volume”? (One of several options Acronis gives, but I’m unsure here... There are several options including RAID 5.)
*I was thinking maybe it’s simply that no drive letter is yet assigned, but I’m not seeing an option to assign one.