No, the Nikon Z9 is not compatible with the Samsung PRO Plus 256GB SD.
Nikon Z9 has no SD slot. Both slots accept only CFexpress Type B and XQD cards. Samsung PRO Plus is an SD card and cannot be used in the Z9.
What works instead
See all compatible camera for the Nikon Z9 →“The camera can be used with CFexpress (Type B) and XQD”
Last verified:
Confidence: inferred