The best way to handle this scenario is to use the default RadAsyncUpload
configuration. It firsts upload files into the temporary folder
and then on postback (clicking Save button) moves uploaded files from temporary to the target folder. Finally, all processed temporary files are deleted. Rest of the files that are not processed are cleared automatically after a set amount of time defined by the TemporaryFileExpiration
property. Default value is 4 hours.
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