Specify Content-Type in AWS PHP's upload function

Question

I am migrating my code from AWS PHP SDK1 to SDK2 (https://github.com/aws/aws-sdk-php).

I have an image uploader. In my previous version, I would specify the Content-

Answer 1

At the end, this set of options worked:

array('params' => array('ContentType' => $mime))

No need for Metadata