Required columns: Style No · Gross Weight · Net Weight
Optional: Date · Sub Category · Purity
• Columns are matched by name, never by position — any column order works
• Style No must exactly match the photo file name (without .jpg)
• Weight must be a plain number — do not type "g"
• These header names are also accepted:
StyleNoWeightItemNetWtDesign No
• If the same Style No comes again, the old row is overwritten — no duplicate is created