qwen2-1/image-to-imageimage-to-image10 paramsTakes up to 10 references, the most of any Qwen endpoint (Qwen 3 caps at 3). Supplying mask_url is a MODE SWITCH, not an extra option: it demands exactly one reference image, forbids a transparent background, and makes aspect_ratio and enhance_prompt no-ops that Kie lists in an `ignored` field rather than rejecting. All three are encoded as constraints so the form cannot build the request Kie would silently reinterpret.