If your CSV has headers (column names in the first row), keep the checkbox checked. Uncheck it if your file starts directly with data.
Make sure that the column names are different from each other and in the specified order.
Upload a CSV file with 2 columns:
With headers:
Location,Direction A1-01,Up A1-02,Down
Without headers:
A1-01,Up A1-02,Down
Each column becomes a colored block
With headers:
code1,code2,code3 H7-10-C,H7-20-C,H7-30-C
Without headers:
H7-10-C,H7-20-C,H7-30-C H8-10-C,H8-20-C,H8-30-C