Question about PDF and Word Extensions

I teach in higher education and use several different LMS systems (Moodle, Blackboard, D2L, and Brightspace), in the past few hours I learned that these use HTML5 if that helps understand the problem. When students upload MS Word and PDF files, I’m finding that Brave is not able to open these at all. Do I need to add an extension? Asking because this is very annoying and one problem that would stop higher education specialists from using this product. Any insight would be greatly appreciated.

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