テスト用コード＠ドラッグ＆ドロップのファイル版 Drag And Drop Api for File

DragAndDropEmulate.js

var ary_u8 = new Uint8Array([0x30,0x82,0x06,....]); // byte code
var file = new File([ary_u8], 'file name', {
    lastModified: new Date(0),
    type: "application/json"
});

var dispatchDrop = function(ary_u8){
  var createEvent= function(type) {
    var event = document.createEvent("CustomEvent");
    event.initCustomEvent(type, true, true, null);
    event.dataTransfer = {
      files: [ ary_u8 ]
    };
    return event;
  }
  var type = 'drop';
  var elm = document.querySelector('.upload-drop-zone');
  var event = createEvent( type );
  elm.dispatchEvent( event );
}

dispatchDrop(file);