With the Linux AppImage version of Cryptomator and following the startup help, the wizard does not recognize any of my connected disks whether Google Drive or NextCloud.
I can’t choose a network drive in the left panel.
Is this specific to Fedora 39 under KDE or am I missing a software brick?
This is not specific to your system, but you are missing something indeed.
Cryptomator can only access your vault over the local filesystem. If you connect to GoogleDrive with Dolphin, this is an KDE specifc integration. You have to create an google drive “access point” in your local filesystem. The following project can do this: