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Application Document Upload Mimetype

Hej there,

we're trying to upload some documents to the application api and always getting the problem, that the files inside the personio backend does'nt get a correct preview neither can be downloaded correctly.

It seems that the mimetype of the uploaded files get lost, so it's always "text/plain".

We're using PHP with guzzle to request the api and having a nearly similar code like the api documentation example:


$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.personio.de/v1/recruiting/applications/documents', [
  'multipart' => [
        'name' => 'file',
        'filename' => 'gitlab-icon-rgb.png',
        'contents' => 'data:image/png;name=gitlab-icon-rgb.png;base64,iVBORw0KGgoAAAANSUhEUg....',
        'headers' => [
                'Content-Type' => 'image/png'
  'headers' => [
    'Accept' => 'application/json',
    'Authorization' => 'Bearer XXX',
    'X-Company-ID' => 'XXX',

echo $response->getBody();

When sending this autogenerated code to the api, I'm getting the following result:

"extension": "txt",
"mimetype": "text/plain",
"original_filename": "gitlab-icon-rgb.png",
"uuid": "f198a250-c093-4d07-bbc0-8e9b0cbdf05f",
"size": 21187

So the api is detecting a "text/plain" mimetype, but I was uploading a "image/png" mimetype. What is wrong with the request?