Images not uploading to Shopify? Workflow successful but no images appear

Hello

I’ve built a workflow in n8n that successfully sends product data to Shopify. The workflow completes without any errors, but the product images do not appear in the Shopify admin.

My setup includes a workflow that downloads product images, modifies them using an AI service to generate new product visuals, and then attempts to upload these modified images back to Shopify together with the product data. The modified images are publicly accessible via a URL, and I’m including them in the images array of the product creation request (via the Shopify REST API).

Despite this, the images don’t show up in the Shopify backend.
Has anyone run into this before?
Do the images maybe need to be uploaded in a different way—perhaps using a separate API call or as base64 instead of URL?

Thanks for your help!
Holger