Files dropped on the Combine files tab are handled as one batch: they join
the end of the list in the order dropped, as one undo step, from their path
or, when a drop carries only bytes, from those. A folder still adds the
files in it and its subfolders. Files of a kind Combine doesn't take are
left out and named in a notice, instead of joining the list as files that
can't be read. In a browser the dropped files are read one after another,
so they keep their order too.
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