For my photoblog on wp.com I have recently adapted the Nishita theme. When I click on a tag to access archive posts, the posts where I embed flickr images do not show any thumbnail. If I upload images directly to a post it shows it. Here is an example:
I mainly embed images from my flickr site and I do not want to upload images to wp. In other themes when I click on tags I usually get the image thumbnails.
I have already contacted the Nishita theme creator but they have informed me to direct my question to wp.com.
I have already found another (closed) topic about this issue, there it was mentioned to have "featured image". In my case this is not true. If I upload an image on my post (and not set a featured image) the thumbnail appears. If I embed via flickr it does not. Furthermore I can not select a featured image via flickr (link).
I hope wp.com can adapt the theme. For photography-oriented theme thumbnails should appear if there is an image in the post (whether uploaded or embedded).
The blog I need help with is kaldirimlar.com.