Upload extend - MountSea API

Same as Extend, but the source is a public audio_url instead of clip_id. POST /suno/v2/generate returns { "taskId" }. Poll Get Task Status. Schema: GET /suno/v2/generate/schema?task=upload_extend.

Parameters

Field	Required	Notes
`task`	Yes	`"upload_extend"`
`model`	Yes	`chirp-v6` recommended
`audio_url`	Yes	Public MP3/WAV URL
`continue_at`	No	Second to start from
`controls.audio_weight`	No	How much of the original audio to keep, 0–1

Other optional fields: shared list.

Example

{
  "task": "upload_extend",
  "model": "chirp-v6",
  "title": "My Song Extended",
  "tags": "Pop, Happy",
  "audio_url": "https://example.com/my-audio.mp3",
  "continue_at": 15,
  "controls": { "audio_weight": 0.6, "style_weight": 0.5 }
}