Yes, the Nikon Z30 is compatible with the Transcend 700S V90 128GB.
Transcend 700S V90 is V90 class. Meets the floor for: 4K30 (30 MB/s floor). (Rated write 180 MB/s is not evidence of sustained performance; the V90 class rating above decides this.)
“Nikon Z30 specifications: storage media is SD and UHS-I compliant SDHC and SDXC memory cards. UHS-II SD cards operate in UHS-I mode in this slot.”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)