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What does quarantine mean? Did it moved files created by Cryptomator somewhere else or did it prevented file creation?
If the encrypted files are not present in the vault storage location, there is also nothing Cryptomator can display.
If the files are there, the directory link might have gone missing. To restore directories, see
Data Lost: How to restore missing Directories.
You can also check the logfile, if it contains any ERRORs, WARNings or Exceptions. To see the log file, open the general preferences and click on the bottom on “Reveal log files”. Your file manager opens with a directory containing the log files. Check the most recent one.
