Steps to Reproduce

<button label="Upload" upload="true">
<dropupload/>

1. upload any big file > 1 MB with an upload button or dropupload

Current Result

no progressbox

Expected Result

zk shows a progressbox

Debug info

• 9.6.5 shows a progressbox
• one root cause is : fetch.js
  ajaxFetch = function (input, init)

  if (uploadCallbacks.length) {
                  xhr.onprogress = function () {
  

  It should register on xhr.upload.onprogress