I have recently installed MacOS Big Sur Developer Beta, and Cryptomator doesn’t work. I hope you fix the issues before it reaches public beta. Thank you!
Edit: So, the issue seems to be the fact that Apple has updated some drives and now Google Drive just doesn’t work. Cryptomator works fine with iCloud drive without any issues what so ever–whether you are uploading or downloading stuff. The errors were caused by Google Drive failing to launch.