File uploader getValues() returns empty string

Webix JS
#1

In this example get value button returns empty string
https://docs.webix.com/samples/21_upload/01_init_list.html

#2

Currently, server-side of ui.uploader samples if down, we will fix it.
But in fact, getValue returns only files which were successfully uploaded to the server
(i.e. has status:"server").

All files are available as uploader.files