Composer blog elements - thubnail

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Hi guys!

Can anyone tell me how to include thumbnail to composer (as in sample content)?
I installed c5 with sample content, then was playing with it a little bit, and one of things that I've done was, that I excluded Thumbnail image (in page type defaults) from composer. But when I included it back, it turned to regular image block, and don't open in image editor as it used to...
How to revert that?
And in general - how to add thumbnail, and header image as it is when we install sample content?

MysteriousCleon
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MysteriousCleon replied on at Permalink Reply
MysteriousCleon
Really no one knows how to do that?