What specific brand of card are you using? Also, is it full-sized or micro?
Did you attempt to format the card in the C300?
Hi, RNWalkabout! Are you sure it's a 32MB card? We ask because that's a really, really small capacity and Cinema EOS cameras generally require far larger capacity like what you'd find on a 32GB card. Please verify this so that the community can get the clearest possible picture of what's going on.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
2/07/2023: New product announcements!EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM