Thank you for your feedback.
First of all, I would like to ask you whether you use the classic RadUpload or you use RadUpload "Prometheus" as v2.3.2 is a version of the classic RadUpload while this is a forum thread about RadUpload "Prometheus".
For the moment, we do not have an example which demonstrates the scenario you describe. Depending on the scenario you have you can save the uploaded image files in a folder using the TargetFolder property of RadUpload and take the files form there to display them on the page. You can also delete a selected thumbnail image searching it by name in the target folder.
In case you experience some difficulties in achieving your scenario, send us more detailed information on what you want to accomplish and what kind of problems you experience. We will do our best to help you.
the Telerik team