calling getData() on an image always returns null in PHP library

[Joel Shapiro]

I'm trying to extract data from an existing ResponsiveDisplayAd and move it 
to another following the example in AddResponsiveDisplayAd.php and instead 
of calling:

$image->setData(file_get_contents('http://goo.gl/3b9Wfh'));

would like to call 

$image->setData($originalImage->getData());

The documentation here 
(https://developers.google.com/adwords/api/docs/reference/v201702/MediaService.Image)
 
doesn't lead me to believe that I need to add anything to my selectors. 
These are what I'm selecting right now when I hit the AdGroupService:

$selector->setFields([
        'Id',
        'AdType',
        'BaseAdGroupId',
        'CreativeFinalUrls',
        'CreativeTrackingUrlTemplate',
        'Name',
        'Dimensions',
        'DisplayUrl',
        'MarketingImage',
        'LogoImage',
        'ShortHeadline',
        'LongHeadline',
        'Description',
        'BusinessName',
        'MediaId',
        'Urls'
]);

In the results I access the image via

*foreach *($page->getEntries() *as *$adGroupAd) {
        $currAd = $adGroupAd->getAd();
        $marketingImage = $currAd->getMarketingImage();

        $marketingImage->getData() === null // true
        $marketingImageURLs = $marketingImage->getUrls();

        $marketingImageURLs[0]->getValue(); // string of image URL
}

I don't want to have to use file_get_contents with the image's URL like the 
example, getData() seems like it should be the way to do this. Any help is 
greatly appreciated.

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