When creating a new vault, the iCloud option is missing. I know it used to be there. Currently, the only options are Dropbox and Custom Location. Screenshot attached.
Is there a difference between using Custom Location to select iCloud Drive as the vault location or actually selecting iCloud during the vault creation wizard?
Cryptomator just looks if some default locations of known cloud providers is available on your file system: LocationPresets.java#L15-L18
If you did not install the sync client or did not install it with standard values, or for any other reason that a provider is not listed, just use „custom location“ and select a folder that is synced with your online storage.