image_key (<tenant_id>/external/<uuid>.<ext>). The previous image, if any, is deleted.curl --location --request PUT 'https://ca.omerlo.app/api/ad-ops/v2/creatives/749d5611-e9c0-47ef-ab32-20d520e37664/upload' \
--header 'x-api-key: <api-key>' \
--form 'image=@""'{
"data": {
"id": "497f6eca-6276-4993-bfeb-53cbbbba6f08",
"ad_id": "efc8ccc9-36e5-4f46-953f-51d21c377e1f",
"format": "160x600",
"image_key": "string",
"phone": "string",
"clickthrough_url": "string",
"is_target_blank": true,
"starts_at": "2019-08-24T14:15:22.123Z",
"ends_at": "2019-08-24T14:15:22.123Z",
"timezone": "America/Montreal",
"inserted_at": "2019-08-24T14:15:22.123Z",
"updated_at": "2019-08-24T14:15:22.123Z"
}
}