Yes, the Angelbird AV PRO SD V90 128GB is compatible with the Fujifilm X-S20.
Fujifilm X-S20 has a UHS-II SD slot. Angelbird AV PRO V90 writes at 280 MB/s. X-S20 requires V30 for 4K30 and V60 for 4K60. Angelbird V90 exceeds both thresholds — compatible with all X-S20 video modes.
“Storage media SD Card (-2GB) / SDHC Card (-32GB) / SDXC Card (-2TB) / UHS-I / UHS-II / Video Speed Class V90”
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Confidence: inferred