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Why are some Quick Link thumbnails not shown in WhatsApp?

The most common issue with Quick Links not rendering thumbnail previews in WhatsApp is the image file size being too large. Although Facebook supports the display of Open Graph images up to 8 MB in size, their WhatsApp product appears to have different, undocumented size limitations. We've seen that WhatsApp generally displays thumbnail previews for images up to 300 KB.

If your image file is larger than 300 KB, try reducing the image file size by adjusting your image dimensions or compression settings.