So far we've seen this only when:
- The server is rebooted unexpectedly. Shutting down the application pool is enough to remove any leftover files.
- You access the FileStream and don't dispose it.
Current internal builds delete the file immediately after the FileUploaded event has been fired. This way the chances for leaving files is even slimmer.
I hope this helps.
All the best,
the Telerik team
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