I've seen hints that the native Grid Fieldtype allows multi-file uploads but I can't find that feature.
http://devot-ee.com/add-ons/jf-multi-file-field says "the new ‘Grid’ field does everything this add-on does" and one of the comments on http://ellislab.com/blog/entry/introducing-grid-new-in-expressionengine-2.7 seems to indicate the same.
but I must be missing something. can someone explain how I can upload multiple images into the grid?