Yes, the Canon EOS R6 Mark II works with the Samsung PRO Plus 256GB SD — but only 4K30 IPB Standard supported via the U3-rated SD card. 4K60.
Samsung PRO Plus is UHS-I, rated UHS Speed Class 3 (U3) per Samsung's own spec page. Canon R6 Mark II's manual requires only UHS Speed Class 3 for 4K30 IPB Standard; 4K60 requires Video Speed Class V60. Card clears 4K30, fails 4K60 -- corrected 2026-06-21, previous verdict cited an unsourced "200 MB/s" floor (the same class-label mistranslation already fixed 2026-06-20 for sibling cards on this body).
Conditions for compatibility
4K30 IPB Standard supported via the U3-rated SD card. 4K60 requires Video Speed Class V60 -- this card is V30, does not meet that floor.
“29.97 fps 25.00 fps 23.98 fps IPB (Standard) UHS Speed Class 3 or higher IPB (Light) SD Speed Class 10 or higher”
Last verified:
Confidence: inferred