Yes, the Canon EOS R5 Mark II is compatible with the Kingston Canvas Go! Plus microSDXC 128GB.
Canon EOS R5 Mark II has a full-size SD card slot. Kingston Canvas Go! Plus microSDXC 128GB is V30-rated (90 MB/s is an uncertified peak figure, not a sustained guarantee) -- fits via the bundled microSD-to-SD adapter and clears this camera's lowest-tier SD-recordable mode, but its certified V30 rating (30 MB/s sustained) falls well short of the V60/V90 floors this camera's higher SD-recordable modes require.
Limitation
Cannot record 4K60 (Video Speed Class V60), 4K120 (V90), or any CFexpress-only Intra/RAW mode -- Canon's own manual lists no SD card alternative for these modes, this card is V30. The bundled microSD adapter provides physical fit only; it does not change the card's class rating. Works for 4K-UHD Fine Standard LGOP (29.97/25/24/23.98fps) via the SD slot.
“CFexpress cards Type-B compatible SD/SDHC/SDXC memory cards UHS-II and UHS-I cards compatible Cards That Can Record Movies When recording movies, use a CFexpress card that supports VPG400 or a card wi”
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