Responsive Images: display versus download size?

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I have several responsive images placed on the page. Extra thumbnails (small:740px, medium:940px, large:1140px) are created by the theme automatically.

When I drag an image to the desktop it downloads always the original size and name of the image. Is that the correct behavior?

I have one block which behaves different: When I drag the image to the desktop, the name of the image changes to e.g. ef7aosdifzuaw8r76qewtwr7s9fg860r9.jpg and the size is always 600x400px.

What’s going on? Can anybody shine some light on this?
I have read through all relevant documents on the Concrete5 site, - maybe I have missed something.


Thanks you all for hinting.



Concrete5 v.8.5.2 with theme «Elemental», PHP 7.2

 
ConcreteOwl replied on at Permalink Reply
ConcreteOwl
The ef7aosdifzuaw8r76qewtwr7s9fg860r9.jpg file is probably a cached thumbnail file.
The other ones are probably full sized images that have been resized using css.