Hello Kevin Donahue,
1) Pressing the Cancel button should cancel the upload and notify the server about this action. Does this happen on your side?
2) You need to set the OperationComplete property to true either on the server side or on the client. On the server, it can be accessed using:
the RadProgressContext class is inside the Telerik.Web.UI namespace.
On the client you can add handler for the OnClientProgressUpdating
event of RadProgressManager and set true to the args.ProgressData.OperationComplete property
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