Yes, the Canon EOS R3 works with the SanDisk Extreme microSDXC UHS-I 128GB — but only requires the bundled microSD-to-SD adapter (included with the card); clears.
Canon EOS R3 has a full-size SD card slot. SanDisk Extreme microSDXC UHS-I 128GB (real write speed 130 MB/s) fits via the bundled microSD-to-SD adapter and clears every recording mode including this camera's top-tier mode requiring Video Speed Class 90 (90 MB/s).
Conditions for compatibility
requires the bundled microSD-to-SD adapter (included with the card); clears every recording mode including the camera's V90-tier mode.
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