Even though the W3C specification that makes folder dropping possible (the Filesystem API) has been deprecated, both Firefox and Edge have added support, at least on paper. We need to verify that this actually works as expected in these browsers before feature charts are updated and DnD support becomes officially supported by Fine Uploader in these browsers.
As a user, you can help by reporting your success or issues here. I suspect folder dropping should just work in these browsers though.
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