Convert files

curl --request POST \
  --url https://convertly.sh/api/convert \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form 'files=<string>' \
  --form files.items='@example-file'

{
  "files": [
    {
      "filename": "<string>",
      "originalSize": 123,
      "finalSize": 123,
      "savedPercent": 123,
      "mimeType": "<string>",
      "downloadUrl": "<string>",
      "appliedQuality": 123,
      "storedFileId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
    }
  ],
  "storage": {
    "saved": true,
    "notice": "<string>"
  }
}