Make an app and get access token
https://graph.facebook.com/me?fields=id&access_token={access_token}
POST https://graph.facebook.com/{api-version}/{ig-user-id}/media ?image_url={video-url} &media_type={media-type} &access_token={access-token}
POST https://graph.facebook.com/{api-version}/{ig-user-id}/media_publish ?creation_id={creation-id} &access_token={access-token}
IMAGE_KEY USER_ID TOKEN