Minor issues in Document collection upload at kie server (jbpm-ui)

There are still some open issues:

If there is a file attached to the form from BC, it doesn't come up when accessing the task form.
Drag files here section disappears and no longer comes back once you start dragging and dropping files. It always shows Drop files here
Once the task is complete, and if you come back to check the task, UI will keep on displaying Drop files here and allows you to remove docs (though only from the UI, not from the backend side)
There is no validation with regards to some of the options enabled/disabled in the task form such as:
Required
Read Only
Max Files