I am running the latest beta (Version 3.0.1 (1119)) and it opens documents happily from the File/Open menu. Trying to open the same document from Finder triggers the warning "Apple could not verify “hogarth-curves.md” is free of malware that may harm your Mac or compromise your privacy." and gives me the option to "Done" (which does nothing of course, or "Move to Bin".
Is there some setting I have missed?
Actually this may not just be related to Marked after all.
Regards
Christopher
MacOS Sequoia 15.75