curl --request POST \
  --url https://cloud.onyx.app/api/manage/admin/connector/{connector_id}/files/update \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form 'files=<string>' \
  --form 'file_ids_to_remove=[]' \
  --form files.0.items='@example-file'

{
  "file_paths": [
    "<string>"
  ],
  "file_names": [
    "<string>"
  ],
  "zip_metadata": {}
}