shopify_file_unavailable
Status 502. Shopify did not send the picture.
What it means
The picture at source_url could not be fetched from Shopify's CDN. Nothing was kept.
What to do
Check the address opens in a browser, then send the request again, or upload the file itself.
Safe to send again?
Yes. Send exactly the same request again; for a points change or a cancel, with the same Idempotency-Key.
Where you can meet it
POST /stores/{store_key}/images: Upload a picture for the store's branding (a logo, a square logo, a cover)
Every code, and the shape of an error answer: Errors.