curl --request POST \
  --url https://api.myscalev.com/v3/variants/{variant_id}/digital-product-files \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file'

{
  "content_type": "<string>",
  "id": 123,
  "name": "<string>",
  "size_in_bytes": 123,
  "url": "<string>"
}