After uploading a file to Commons, a preview should be generated and displayed. However, the preview generation often fails, and no image is shown after upload (see attached screenshot).
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Does this only happen with PDF files? "often fails" - do you have more example files?
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I don't know if it happens with PDF files or not: my example was of a JPG. Apologies for the confusion caused by the screenshot being a PDF!
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"Often fails" - it's happened with around 50% of the files I've been uploading in the last week or so (a sample of a few hundred).
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https://commons.wikimedia.org/wiki/File:Beaumaris_Castle_2015_012.jpg displays a thumbnail preview for me so I cannot reproduce.
What are other examples?
Or maybe the problem just happens right after uploading and the thumbnail creation service is "just a bit slow"?
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"Or maybe the problem just happens right after uploading and the thumbnail creation service is "just a bit slow"?" - yes, this is probably the issue. The images all show up fine a short time after uploading, but they weren't showing up on the page you see after the upload has been done ~50% of the time.