By default, the file will be uploaded to the temporary location (App_Data/RadUploadTemp) before being transferred to its final location. This allows you to inspect the uploaded files in the code behind and filter out any files that you don't want to store.
The temporary file location can be changed using the TemporaryFolder
You can also customize the upload handler to directly store the files to their final location or even in a database. Please follow the instructions for this demo - Images Uploader
I hope this helps.
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