curl --request POST \
  --url https://api.hubapi.com/media-bridge/2026-03/{appId}/settings/object-definitions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "mediaTypes": [
    "VIDEO"
  ]
}
'

{
  "createdObjects": {}
}