Create Voice

curl --request POST \
  --url https://eu.api.gradium.ai/api/voices/ \
  --header 'Content-Type: multipart/form-data' \
  --form audio_file='@example-file' \
  --form 'name=<string>' \
  --form 'input_format=<string>' \
  --form 'description=<string>' \
  --form 'language=<string>' \
  --form start_s=0 \
  --form timeout_s=10

{
  "uid": "<string>",
  "error": "<string>",
  "was_updated": false
}