Yes, the Angelbird AV PRO SD V90 128GB is compatible with the Sony FX3.
The Angelbird AV PRO SD V90 is an SDXC UHS-II V90 card (260 MB/s sustained write). Its V90 rating meets the FX3's most demanding SD requirement (XAVC S-I 4K needs V90), so it records every SD-recordable mode on the body. Prior record marked this conditional; corrected to compatible.
“XAVC S-I 4K 600Mbps CFexpress Type A memory card (VPG200 or higher) SDXC V90 or higher”
“incredibly fast sustained write performance of 260 MB/s”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)