curl --request PUT \
  --url https://api.hubapi.com/data-studio/data-source/2026-09-beta/{datasourceId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file' \
  --form 'request=<string>'

{
  "datasourceId": 123,
  "datasourceName": "<string>",
  "previewLink": "<string>"
}