Here's a screenshot of summary view in Plone 6
These articles have lead images but their thumbnails aren't showing.
Here's the same page in Plone 6 Classic
Notice that the thumbnails show in Plone 6 Classic
Notice that the thumbnails show in Plone 6 Classic
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There's a "workaround" for this. If you create a page and add a listing block.
Step 1 - In the page add a listing block
Step 2 - set your criteria and use summary variation
(in this case I filter for news and use the summary variation of the block.
Result
...
Is this the "new way" or is the lack of thumbnails on the standard summary view a bug in Plone 6?
We are working on a new way of handling those preview images in Plone 6. The idea is to have a generic and flexible "preview_image_field" indexer/field that all content types provide and that can have an image (for an image it will be the image itself, for a page it will be a preview_image field, etc.). We are currently finishing this together with a teaser block that makes heavy use of this field and allows editors to create sophisticated landing pages (e.g. together with one of the grids solutions).
Thanks @tisto .. I like the direction. I especially appreciate what the listing and search blocks can do out of the box. If the preview_image/preview_image_field also serves as the og image that would very useful.
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The Album View is also broken. See A Gallery Folder
The issue is that the items iterated over in the SummaryView as {content.items.map((item) => (...) do not contain any information on the images:
They also do not contain any date-information, therefore this chapter in the Mastering Plone Training failed on Saturday where we customize that view to display the effective-date:
Hello,
we are currently migrating our website to Plone 6 where we will stick to the classic theme. Our Gallery has the same problem, i.e., it does not show thumbnails for the folders it contains.
In the previous Plone version this was not a problem. It's also been nearly three years since this was discussed here. Is there an option to get this to work now?
We also have a folder that shows up twice, even though it only exists once. Both instances link to the same URL. I'd be grateful for a hint how to solve this as well.
I'd be happy to provide a screenshot or links to our website. However, I'm not allowed to post them.
Kind regards
Raphael
Duplicate folders could be a catalog issue - have you rebuilt the catalog?
Hi Mike,
thank you for helping. However, I don't know what that means. We are using the Docker image and used the collective.exportimport plugin to migrate the content and settings.
Is rebuilding the catalog related to the collective.catalogcleanup plugin?
Raphael
If the importing of the exported content completed successfully then the catalog should be up to date. However to rebuild the catalog go to SIte Setup, Management Interface, portal_catalog and on the Advanced tab click Clear and Rebuild. Don't do this on a production site, ensure the site is backed up and note that it can take a long time if the site is very big.
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Thanks! That took care of the duplicate entry. 
The thumbnail issue in the gallery remains.
I'm also wondering if it is possible to get all links the gallery to be equally sized, i.e., to be a grid rather than each item taking up as much space as it needs.