The CSV file must start with the PATTERN_FILE keyword and contain PATTERN_NAME, which is the name of the imported pattern. Additional comments may be added as needed and must begin with the symbol # as the first character in the row.
To preserve an existing pattern and import a new pattern, you may change the pattern name in the CSV file, or rename the existing pattern in Pulse Building. After the import, the pattern name from the CSV file is added to the list in the Patterns window.
Here is an example of a CSV file header: