Amazon flat file upload fields and common errors

What this guide explains

Learn why an Amazon flat file upload can fail before choosing a preflight checker.

• Blank SKUs, duplicate SKUs, invalid prices, and invalid quantities should be treated as blockers before upload.
• Image URLs and variation fields can make a row look complete while still creating Seller Central errors.
• A row-level report is useful because Amazon upload feedback often arrives after the file has already been submitted.

Separate file-shape problems from row problems

A flat file can fail before Amazon evaluates a single listing when the wrong template, delimiter, encoding, or header row is used. Open the exact file intended for upload, identify the SKU and action columns, and confirm that spreadsheet software has not converted identifiers, dates, or large numbers. Then review row-level blockers such as blank SKUs, invalid prices, invalid quantities, and duplicate identifiers.

• Keep the original template headers instead of renaming them for readability.
• Check identifiers as text so leading zeros are not silently removed.
• Use row numbers in the issue report to repair the source file rather than a copied preview.

Recheck the final export, not only the worksheet

Spreadsheet formulas, hidden columns, and export settings can make the saved upload file different from what was visible during editing. After corrections, export again and run the final file through the checker. Treat a clean preflight as evidence that the tested rules passed, not as a promise that every category rule or Seller Central validation will pass.

• Save a dated backup before replacing quantities, prices, or listing fields.
• Confirm that URLs and required action values survived the export.
• Keep Amazon's processing report because it can surface account- and category-specific rules.

Sources and further reading

• Amazon Seller Central: Inventory file templates — Current Amazon template guidance; Seller Central sign-in may be required.