id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
13533	No progress during upload	Piotr Jasiun	Szymon Kupś	When a file is dropped into the editor, progress notification show `0%` and then jump to the `100%`. It might be because browsers do not sent `onprogress` event but I see other libraries do it better. Maybe it is because we use `xhr.onprogress` and maybe we should use `xhr2.upload.onprogress`. Maybe the order of adding listeners is wrong (now they are added before `xhr.open` what seems to be correct but maybe it is not). Maybe it is because we show only progress of uploading, not loading, but in fact it is loading what is the most time consuming. Or maybe it is simple a bug. This should be investigated.	Bug	closed	Normal	CKEditor 4.5.4	General	4.5.0 Beta	fixed