Yes, the OM System OM-5 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.)
“OM System OM-5 product page: 4K 30p at up to 237 Mbps; UHS-II SD cards with sufficient write performance support all recording modes.”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)