Here is a copy of my post to your support ticket:
To my regret,
due to browser restrictions, the programmatic call of the browse dialog
of a file input would further prevent the selected file from being
uploaded. What I mean is that you can call the file input's click()
method to open the Browse dialog. However, using this approach, when
you submit the form you would either get an "Access is denied" error,
or you would end up with the file input cleared and the page not
submitted depending on the type f button you click to submit the form.
You can implement some kind of a workaround by allowing your users to submit the form only if they have selected a file.
the Telerik team
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