Additional image tag invalid

CAT_VALIDATION_ERROR_ADDITIONAL_IMAGES_TAG_INVALID fires when image tags supplied with extra media use unsupported characters or values. Tags must be short alphanumeric labels matching Snap's accepted tag list.

Snap Catalog Manager requires product images that are publicly reachable, sized within the platform's bounds, in supported formats (JPEG/PNG typically), and free of overlays, watermarks, retailer logos, or text callouts. This issue trips when one of those constraints is broken.

1. Open the image URL in a private/incognito browser — confirm it loads without authentication or bot challenges.
2. Check minimum dimensions (most channels: 500x500 or 800x800), file size limits, and supported formats. Re-export as JPEG quality 85–95 if compressed below threshold.
3. Strip promotional overlays, watermarks, store logos, and call-out badges — the main image must show only the product.
4. Re-host on a stable CDN if your origin host is rate-limiting or blocking the platform's crawler.
5. Re-submit the feed; image changes typically propagate within 4–24 hours.

• CDN auto-serves WebP — the channel may need an explicit .jpg variant
• Watermarks added by photographers — must be removed even if rights are licensed