I'm using Big Sur, but this problem was also happening with the previous macOS. When I received a mail message that I wanted to keep, I would "copy" it to my iCloud folder. For some reason I can't do this anymore. When I attempt to do it, it appears to work, but when I then open the iCloud mail folder, it's empty.
I'm wondering if I accidently checked some box to prevent these copies. I've lost several messages that I was "storing" in my iCloud folder.
I'm wondering if I accidently checked some box to prevent these copies. I've lost several messages that I was "storing" in my iCloud folder.