Yes, the Canon EOS R50 is compatible with the Kingston Canvas React Plus V90 128GB.
Kingston Canvas React Plus writes at 260 MB/s. Canon R50 needs 60 MB/s minimum for 4K30. Passes by a wide margin.
“Canon EOS R50 Compatible Cards: SD/SDHC/SDXC memory cards — UHS-I cards supported; UHS-II cards operate in backward-compatible UHS-I mode per Canon online manual.”
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Confidence: inferred