Problem with upload API and character with accent

Hello,

I have some problème with the upload API. When my fichier contain accent, the API return a status 401 and when I change the character without the accent it works. But in french, we need the accent. I want to know if there is a solution for this?

For the moment I use unicode() for change automatically characters that are problematic.

This is the code I use for uploading a file with the API:

return await axios({
    url: url,
    method: 'post',
    data: metadata,
    headers: {
      'Authorization': 'Bearer ' + stockageInfo.token,
      'Content-Type': 'application/octet-stream',
      'Dropbox-API-Arg': JSON.stringify({
        path: dossierId + '/' + unidecode(titre) + '.' + ext,
        mode: 'overwrite'
      })
    }
  }).then((d) => {
    return d.data.id
  }).catch((e) => {
    // statements
    console.log(e)
    return null
  })