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Attach from the composer, or reuse anything already in the media library.

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Requirements differ per platform

The composer enforces each platform’s rules before it lets you schedule, which is why a post that is fine on X may be blocked on Instagram. The two that catch people most often:
  • Some platforms will not accept a text-only post. Instagram and TikTok both require media.
  • Aspect ratio and duration are enforced by the platform, not by Nushir. A video the composer accepts can still be rejected on publish if it falls outside what the platform allows.
See platform reference for the per-platform table.

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Uploading over the API

Two routes, depending on where the file is. Local file:
Already at a public URL — the server fetches it directly, so a large video never travels through your process:
Both return a media item. Reference its id from the post:
upload-from-url sends no credentials with its fetch, so the URL has to be publicly reachable. A signed URL works; a private bucket path does not.