curl --request POST \
  --url https://studio.edgeimpulse.com/v1/api/organizations/{organizationId}/custom-block \
  --header 'Content-Type: multipart/form-data' \
  --header 'x-api-key: <api-key>' \
  --form type=transform \
  --form blockId=123 \
  --form tar=@example-file

{
  "success": true,
  "error": "<string>",
  "id": 12873488112
}