Thank you for contacting Telerik Support.
RadAsyncUpload control use Silverlight/Flash/IFrame module under IE9- browsers. The first two are based on the popular plugins. Sometimes the plugins have unexpected behavior which unfortunately is beyond our control. In order to determine whether your issue comes from them please set DisablePlugins
property to true
. This will force the control to use IFrame module (it is based on standard input type='file' element).
If you still reproduce the mentioned behavior please setup a working sample project and send it back for a local investigation.
I will be glad to assist you further.
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