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Public URL of the video. Meta: uploaded via chunked transfer on /act_X/advideos, then the request blocks on Meta's transcoding until status.video_status === 'ready'. LinkedIn: uploaded via the Videos API (multipart), then the request blocks until LinkedIn finishes transcoding (status AVAILABLE) — short clips take ~10-30s. Provide either `url` or `id`.
[optional]
id
String
Meta only. Reuse a video ALREADY uploaded to this ad account instead of re-uploading the file: pass the `videoId` returned by a previous create. Wins over `url`, so N ads that differ only in copy share one upload (`existingCreativeId` only covers the identical-copy case). Provide either `url` or `id`.
[optional]
thumbnail_url
String
Public URL of a still-image thumbnail for the video. OPTIONAL: when omitted on Meta, the poster is auto-generated from Meta's own preferred video thumbnail (the same candidates Ads Manager shows), so video ads publish without supplying one. Provide it to control the poster frame exactly (uploaded as an ad image and referenced in object_story_spec.video_data). Ignored by LinkedIn (auto-generated poster frame).