getDownloadUrl's third parameter not doing what I expect?

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Hello all. I have written a bit of code that performs the following steps:

  1. A lightbox is presented to the user with some data and a download button. When a user clicks on one of the download buttons, a backend call is made which does:

  2. Generate some bibliographic text

  3. Save it as a .txt file to the Media Manager (I would save it as an extension like .ris or .bib, but those MIME types are not allowed)

  4. Return the result of calling mediaManager.getDownloadUrl

The problem here is that the result of mediaManager.getDownloadUrl is returning filename.txt instead of filename.bib. Here is a small sample of code to demonstrate what I’m talking about.

export async function DownloadCitation(citation, fileName, downloadFileName) {
  let b = Buffer.from(citation);
  let uploadResult = await mediaManager.upload("/citations", b, fileName, {
    "mediaOptions": {
      "mimeType": "text/plain",
      "mediaType": "document"
    }
  });
  
  let downloadURL = await mediaManager.getDownloadUrl(uploadResult.fileUrl, null, downloadFileName, null);
  return downloadURL
}

The documentation (getDownloadUrl - Velo API Reference - Wix.com) implies that the third argument will allow me to specify the actual downloaded file’s name. However, that does not seem to work.

Any thoughts?