Implement functionality that enables the dynamic change of the chunk size when uploading a file.

This change should depend on file size and upload speed. 

Hello,

It appears that the Upload control is not including the header: X-Requested-With when using it in Async mode. Omitting this header is a departure from the way the other controls behave in asnyc mode. It's inconsistent and leads developers to not be able to rely on features/behaviors of the supplied the controls.

Please consider adding this header as it will bring this control functionally in-line with the behavior of other controls running in async mode.

Thanks,

Mike

Describe the bug

The upload button is not clickable on Mac in Safari

Workaround - http://dojo.telerik.com/egUMImEp/3

To reproduce
Steps to reproduce the behavior:

1. Open this Dojo example on Mac in Safari - https://dojo.telerik.com/iRiVEYUS
2. Select a file
3. Try to click the Upload button

Expected behavior

The upload button should be clickable

Affected package (please remove the unneeded items)

• theme-default
• theme-bootstrap
• theme-material
• theme-tasks

Affected suites (please remove the unneeded items)

• Kendo UI for jQuery

Affected browsers (please remove the unneeded items)

• Safari

Build system information (please remove the unneeded items)

• OS: Mac

Bug report

Scenario 1: When you first select an invalid file and then a valid one, the upload button appears but does nothing.

Scenario 2: When you select a valid file and then an invalid one, if you hit the upload button, the widget will try to upload the invalid one and produce a server error.

Reproduction of the problem

Scenario 1

1. Open this demo - https://demos.telerik.com/kendo-ui/upload/index
2. Select a .PNG or another invalid file.
3. Select a PDF ( or another valid file)

Scenario 2

1. Open this Demo - https://demos.telerik.com/kendo-ui/upload/index
2. Select a PDF ( or another valid file)
3. Select a PNG ( or another invalid file)
4. Press Upload button

Current behavior

Scenario 1
The Button appears but does nothing

Scenario 2
The widget attempts to Upload the invalid file and produces an error

Expected/desired behavior

Upload of invalid files shouldn't occur and no errors should be thrown;
A non-responding Upload button shouldn't appear.

Environment

• Kendo UI version: 2022.3.913
• Browser: [all]