Instagram API poll_attachment on Reels: how the add-on works
Set poll_attachment when creating a Reel container: two to four options, 3 days by default, Facebook Login only. What Sume prepares before that call.
Pass poll_attachment as a JSON object of options in the POST /<IG_USER_ID>/media call that creates the Reel container. The changelog entry of Sep 28, 2026 says a poll offers two to four options, runs 3 days by default, and is available only in Instagram API with Facebook Login.
Everything here about Instagram is from the Instagram platform changelog, read 2026-09-30. Sume does not publish to Instagram; it prepares the MP4 you upload.
How is a poll configured and read back?
| Piece | What the changelog says |
|---|---|
| poll_attachment | A JSON object containing the options for the poll |
| is_poll_duration_extended | Set to true to leave the poll open indefinitely; default is 3 days |
| GET /<IG_MEDIA_ID>/poll_attachment | Returns options and each option's share of votes |
Can I run a poll on a Story?
No. Stories are not supported, and the read endpoint rejects story media. Reels and feed posts are. A poll is also exclusive with the other add-on type, a comment prompt; see comment prompts on Reels.
What does Sume do before the container call?
Timeline 1.0 renders a 1080x1920 MP4 by default, a vertical frame that suits a Reel (Timeline docs). To fit a length, video trim cuts a range of 0.2 to 900 seconds from a Sume-hosted clip (Video trim); the source must already be on Sume hosting, since there is no open-internet fetch. See also Instagram Reels API video requirements.
Sources
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