I don't use the browser on my Kobo devices very often, but, I have tested this in the last couple of weeks so know that it works. That would have been with firmware version 4.26.16704 and calibre 5.13. I can't test 5.14 at the moment, but, I'll try to remember tonight.
Other than that, the simplest answer I can think of is that the browser will only download supported book formats. You can download epubs or PDF, but, not AZW3 or KFX.
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