File upload from form with Http Client

I have read the part about the Http Client:

$http = new Client();  $response = $http->post('http://example.com/api', [    'image' => '@/path/to/a/file',    'logo' => $fileHandle  ]);

and I have read the part about file input:

echo $this->Form->create($article, ['type' => 'file']);

But how can I combine them so that the file from the form is uploaded?

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