def post_instagram(caption: str, media_path: str | None, region: str, timezone: str, content_type: str):
    """
    Implement via Meta Graph API (IG Content Publishing).
    Requires: IG business/creator + linked FB Page + access token.
    """
    # TODO:
    # 1) upload media container
    # 2) publish container
    # See Meta docs for IG Content Publishing endpoints.
    print(f"[IG] region={region} type={content_type} caption={caption[:40]} media={media_path}")