RadAsyncUpload requires a postback to be performed in order to save the selected file/files to the specified Target folder. After a user selects a file it is automatically saved in the temporary folder (default or specified through the TemporaryFolder
property), then on postback it is copied to the Target folder and deleted from the temporary folder. If no postback occurs the temporary file will be automatically deleted after the time set in the TemporaryFileExpiration
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