Thank you for contacting us.
Indeed the size of the upload control is predefined. This is because we would like to guarantee it is good enough.
However you can change these values in order to get the best of your UI. Below are our default values:
MinHeight = 175
MinWidth = 350
MaxHeight = 300
Width = 400
Please try to change them and let us know if you need further assistance.
All the best,
the Telerik team
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