Files get corrupted when uploading

Files get corrupted when I upload a doc, docx or pdf file:

dbx.filesUpload({ path:  path, contents: fs.readFileSync(filepath) })
    .then(function (response) {
        console.log(response);
    })
    .catch(function (err) {
        console.log("Error:");
        console.log(err);
    });

[smarx]

@ThomasBormans, drop the 'utf8' from your call to fs.readFile. Zip files are not UTF-8 encoded.

[ThomasBormans]

I have the same problem. I have a zip file and the following code:

var fs = require('fs');
var path = require('path');
var Dropbox = require('dropbox');
var dbx = new Dropbox({
    accessToken: 'my_access_token'
});

fs.readFile(path.join(__dirname, '/test.zip'), 'utf8', function(err, contents) {
    var options = {
        path: '/test.zip',
        contents: contents
    };
    dbx.filesUpload(options)
        .then(function(response) {
            console.log(response);
        })
        .catch(function(err) {
            console.log(err);
        });
});

When the file is uploaded, it automatically downloads on my computer (through the Dropbox app for Mac) in my root folder of Dropbox. When I try to unzip the uploaded file, I get the following message: `Unable to expand “test.zip” into “Dropbox”. (Error 21 - Is a directory.).

This is the output from the Dropbox sdk:

{
  name: 'test.zip',
  path_lower: '/test.zip',
  path_display: '/test.zip',
  id: 'id:qMqpuUbnx70AAAAAAApQWg',
  client_modified: '2016-09-17T09:15:09Z',
  server_modified: '2016-09-17T09:15:10Z',
  rev: '2aa3ae00edcb88',
  size: 5505
}

I also noticed that the uploaded zip has doubled in size compared to the original zip. The original zip is 3.259 bytes (4 KB), the uploaded zip is 5.505 bytes (8 KB).

If it helps, I am running node 4.5.0.