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File Manager: How does one use automatically generated thumbnails?

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I noticed there are thumbnails generated for every image in File Manager. But how do I get to use any of them? I'd expect some kind of a list beneath every image to provide option to pick a thumbnail when adding an image.

Is there a way to pick one of them at the moment?
 
A3020 replied on at Permalink Reply
A3020
This is not possible with any of the default blocks. You could however easily grab a thumbnail with some code: 

$f =File::getByID(1);
echo $f->getThumbnailURL('thumnail_handle');


You can manage the thumbnail handles via a dashboard page: /index.php/dashboard/system/files/thumbnails