Yes, the Canon EOS R6 Mark II is compatible with the Transcend 700S V90 128GB.
Transcend 700S V90 writes at 250 MB/s. Canon R6 Mark II 4K60 minimum is 60 MB/s (Video Speed Class V60). Passes by 190 MB/s.
“Canon EOS R6 Mark II Compatible Cards: SD/SDHC/SDXC with UHS-II and UHS-I supported; for movies use a card with ample performance (fast enough writing and reading speeds) per Canon online manual.”
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Confidence: inferred