Yes, the Kingston Canvas Go! Plus microSDXC 128GB is compatible with the Sony FX3.
Sony FX3 has a full-size SD card slot. Kingston Canvas Go! Plus microSDXC 128GB fits via the bundled microSD-to-SD adapter, but it's V30-rated -- the FX3's SD slot requires Video Speed Class V60 minimum for any 4K mode (V90 for XAVC S-I). A V30 card doesn't meet a V60/V90 requirement regardless of its 90 MB/s real-world write speed. Works for XAVC S HD (non-4K) recording only, where the UHS Speed Class 3 floor is what's required.
Limitation
Cannot record any 4K mode via the SD slot -- FX3's own spec requires Video Speed Class V60 minimum for every 4K mode (XAVC HS/S) and V90 for XAVC S-I, this card is V30. Works for XAVC S HD (non-4K, UHS Speed Class 3 floor, met) only. The bundled microSD adapter provides physical fit only; it does not change the card's class rating.
“aximum recordable bit rate Supported memory card XAVC HS 4K 280Mbps CFexpress Type A memory card (VPG200 or higher) SDXC V60 or higher XAVC S 4K 280Mbps CFexpress Type A memory card (VPG200 or higher)”
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