Question

I can’t drop a cloned image. But this works when I comment the helper:"clone" option.

$(document).ready(function(){

    $("#drag").draggable({
        helper:"clone",
        revert:"invalid"
    });
    $("#table4").droppable();

});

Answer 1

the helper is only for visuals.

if you want to clone the image and drop it .. try something like that:

$("#table4").droppable({
    accept: "#page",
    tolerance: "touch",
    drop: function (event, ui) {
        ui.draggable.clone().appendTo(this);
    }
});