curl --request POST \
  --url https://colloqui-web-develop-btoadh.laravel.cloud/api/v1/knowledge-bases/{knowledge_base_id}/sources/add \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form 'files=<string>' \
  --form files.items='@example-file'

{
  "data": {
    "id": "01kqh44eyxxj6hmxzx9ntpsj11",
    "name": "eius et animi",
    "texts": [],
    "urls": [],
    "files": [],
    "created_at": "2026-05-01T06:38:04+00:00",
    "updated_at": "2026-05-01T06:38:04+00:00",
    "workspace_id": "01kqh44eyg8hwjay1v7qhca6xz"
  }
}