Image preview doesn't work in Dolphin, but only when using Firefox file selection (ie upload a file to a website, pic the file to upload)

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12

Your file upload is different from mine. see screenshots
Not sure if it changes based on the site.

your file upload_Screenshot_20240504_125419
your file upload_Screenshot_20240504_1254192023×533 119 KB

my file upload_Screenshot_20240504_125517
my file upload_Screenshot_20240504_1255171321×533 94.2 KB

What site are you uploading to?
Could be a theme difference, I’m using openSUSE Global Theme.

KDE 5 or 6?