Yes, the Fujifilm X100VI works with the SanDisk Extreme microSDXC UHS-I 128GB — with conditions (see below).
SanDisk Extreme microSDXC UHS-I 128GB is V30 class. Meets the floor for: 4K30 (30 MB/s floor). (Peak write 130 MB/s is not evidence of sustained performance; the V30 class rating above decides this.)
Conditions for compatibility
requires the bundled microSD-to-SD adapter (included with the card); camera's SD slot is UHS-I only and this card matches -- Fujifilm doesn't publish a specific speed-class floor for this camera's movie modes.
“Storage media Fujifilm-recommended SD/SDHC/SDXC memory cards Memory card slot SD memory card slot (UHS-I compliant)”
Last verified:
High confidence