Laravel 5.3 - Image validation not working

I have a problem with the validation of images or mimes overall.

This is my code:

$this->validate($request, [
        'title' => 'required|max:50',
        'content' => 'required|min:20',
        'description' => 'required|max:140',
        'file' => 'image'
    ]);

When I try to upload any file I get the error:

The file failed to upload.

When I dont have the image flag, everthing just works fine.

I can put things like required or max:5000.

I looked at the documentation and it should work, but it doesn't.

So what am I doing wrong?

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