bluesky.media.image_video_exclusive - letmepost.dev

What it checks

If the media array contains both kind: "image" and kind: "video" items, preflight rejects.

Why

Bluesky’s record schema (app.bsky.embed.images vs app.bsky.embed.video) is exclusive — a single post embeds either images or a video, never both. There’s no embed shape that holds mixed media.

Failure response

{
  "error": {
    "code": "preflight_failed",
    "rule": "bluesky.media.image_video_exclusive",
    "platform": "bluesky",
    "message": "Cannot attach both images and video to the same Bluesky post; pick one.",
    "remediation": "Split the post: images in one post, video in another. Bluesky does not support mixed media in a single record."
  }
}

Remediation

Send two posts. The second can quote-post or thread-reply to the first if you want them visually linked. If you need mixed media in a single visual, Threads is the platform that supports that — same media shape, just send it against a Threads accountId.

bluesky.media.count_max — also caps at 4 images / 1 video.