Logging level possibilities are explain in the table.
Always set the path of log file to the folder, for which the user, under which the Vault client and Job Processor are running, will have permission to write and change the file.
Warning
At this time, it is not possible to share a single log file location across multiple stations, it means each Vault client and Job Processor with Publisher4VLT add-in installed must have an independent path specified.