Hello Michel,
Thank you for reporting this issue.
This is an already known bug in RadAsyncUpload and and I have increased its fixing priority. You can observe its status and vote for it at our Pits here.
Please excuse us for this inconvenience. Meanwhile if you want to enable and disable the second RadAsyncUpload in the code behind you can use a hidden fields value and the code below:
Hope this will be helpful.
Greetings,
Plamen Zdravkov
the Telerik team
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