Cover frame
A cover moment picked in the editor's render preview rides with the upload, and what happens to it depends on the mode. No pick means the platform chooses its own frame, exactly as before.
| Upload mode | What happens to your cover pick |
|---|---|
| Zernio API | sent as a thumbnail time — Instagram and TikTok take one |
| Zernio CSV | a JPG is cut from each variant and its URL ships with the row |
| Metricool API | not sent: the API has no documented field for a cover, and the run log says so |
| Metricool (Drive + CSV) | a JPG is cut from each variant and its URL ships with the row |
NOTE
YouTube is deliberately not in that list. Shorts take no custom thumbnail, so no cover is sent there in any mode.