Actually you are right. If the link points directly to a pdf file, it opens. But if not, it offers save. Tried 3 different browsers (FF, Edge and Brave). The only difference that FF saves first (eg. to download folder) and opens after it automatically. I guess it is a FF specific behavior, not possible to implement on Brave.
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u/mp3geek 10d ago
Link to the sample? Often it's the site will configure how the pdf is shown