As explained in this
section of the documentation, the TemporaryFiles are deleted when a TargetFolder
is set and the page is submitted. They are also automatically deleted after the time set to the TemporaryFileExpiration
property expires. If this property is not set a default 4 hours expiration time will be used. You can check whether your AsyncUpload has any of these two property set, which would explain the TemporaryFiles removal. If they are not set please post your AsyncUpload configuration so we can test the control's behavior with the specified version 2015.3.930.40
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