Yes, the Canon EOS R7 is compatible with the SanDisk Extreme PRO SD UHS-II V90 128GB.
Canon EOS R7 has dual SD UHS-II card slots. SanDisk Extreme PRO SD UHS-II V90 128GB clears every 4K recording mode, including the highest-bitrate 4K UHD 59.94p/50.00p IPB(Standard) mode, which requires Video Speed Class V60 per Canon's own manual -- this V90 card exceeds that floor with margin.
“L 4K UHD Fine 4K UHD 4K UHD Crop 59.94 50.00 IPB (Standard) UHS Speed Class 3 or higher Video Speed Class V60 or higher IPB (Light) UHS Speed Class 3 or higher 29.97 23.98 25.00 IPB (Standard) UHS Spe”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)