What is the format for a Vault Loader Command Line Tool Mapping File to use friendly column names in a CSV upload file with the -m command parameter?
The Mapping File needs to be a txt file in a Vertical orientation.
An individual mapping must begin with the desired Property Name, followed by an equals (=) sign, followed by the name of the Vault Property. Then, the desired Property Name can be used in the CSV data file column name when uploading into the Vault Loader Command Line Tool.
Vault Loader Documentation: Loading Basics