Check the files before upload:
- Use one product or variant per catalog row, with its own SKU, quantity, retail unit price, and unit cost.
- Use one sold item per sales row. Daily, weekly, or category-level summaries are not sufficient.
- Match the SKU text exactly across both files, including spacing, punctuation, and capitalization.
- Use per-unit retail price, per-unit cost, and per-unit sale price rather than gross sales or line totals.
- Provide the longest reliable sales history available, with at least 120 days when available.
- Use one non-empty worksheet in each XLSX file. Save complex or multi-sheet workbooks as separate CSV files.
Before upload, remove customer names, email addresses, phone numbers, street addresses, payment details, passwords, secrets, and unrelated notes. CMP needs item-level inventory and sales facts, not customer records.