Create a Kling multimodal video editing task via CometAPI: POST /kling/v1/videos/multi-elements to combine multiple elements and generate videos asynchronously.
Send the session_id, edit_mode, final prompt, and any optional generation settings through this endpoint, then save the returned task id for status checks.
Before you call it
Make sure the selection session is already initialized
Confirm your region selection is correct before spending a generation call
Run selection follow-up calls on the same account and with the exact session_id returned by initialization
Set edit_mode to addition, swap, or removal
Provide image_list for addition and swap; omit image_list for removal
Send duration as a string such as "5" or "10"; examples pass "5" explicitly
Treat this route as the final generation step, not the setup step
Add image_list, negative_prompt, mode, duration, callback_url, or external_task_id only when the edit workflow needs them
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