adding 2nd Drag and drop file to the variable\FileList

adding 2nd Drag and drop file to the variable\FileList

How can we add later dragged and dropped items to the previous FileList?

obj.on('drop', function (e) {

            $(this).css('border', '2px dotted #0B85A1');
            e.preventDefault();
            var files = e.originalEvent.dataTransfer.files;

         files1 = files;
            
            var output = [];
            for (var i = 0; f = files[i]; i++) {
                output.push('<li style="list-style-type:square"><strong>', escape(f.name).replace("%20", " "), '</strong>');
            }
            var x = document.getElementById('list');
           
            x.innerHTML += '<ul>' + output.join('').replace("%20"," ") + '</ul>';
            
        handleFileUpload(files, obj);
           
        });

I would like to hold all dragged and dropped file information in files variable.