The error you're seeing in Google Merchant Center indicates that the filename in your product's image_link attribute contains invalid or unsupported characters, specifically the registered trademark symbol (®), which is a non-ASCII character. This can cause the URL to be rejected because the image_link must comply with ASCII-only requirements in the submitted product data.

Update the image_link attribute in your product feed to point to the new filename (e.g., https://yourdomain.com/images/restfulblanket-organisk-hundeseng.jpg).

In your product data feed, encode the ® symbol in the URL as %C2%AE (e.g., set image_link to https://yourdomain.com/images/restfulblanket%C2%AE-organisk-hundeseng.jpg).