Hello Nelbin,
As you have assumed, setting the CanvasMode="No" is the solution of the issue. The reason for that is that when the ImageEditor is used in enabled CanvasMode all changes are made on the Client, and so the ImageEditing event is not fired.
The only downside effects that you will meet is that your users will not be able to use all of the CanvasSupported features of the control (like filtering and drawing), but currently this is the only way to implement a custom Server command.
Kind regards,
Veselina Raykova
Telerik
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