01-20-2021 01:39 PM
Since you are using Big Sur, did you grant privileges to EOSU?
Go to Security & Privacy->Privacy->Files and Folders and see if EOS Utility is there and checkmarked.
01-20-2021 02:58 PM - edited 01-20-2021 03:06 PM
I would suggest that:
1. Go to the support page for the Canon 1D X Mark III for Catalina.
2. Download and install EOS Utility 3.13.10.
3. Follow any prompts.
4. Go to security page and see if permissions there.
That's all I can offer.